Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Troubleshooting Guide

- Previous: Chapter 1 Overview
- Next: Chapter 3 Security Problems

# Chapter 2 Common Problems

This section covers the most common problems you may encounter when using the Application Server:

- `asadmin` `start-domain` Command Fails

- Automatically Restarting a Domain or Node Agent on Reboot

- Cannot Find Log Files

- Accessing Local Server Fails (`http://localhost:8080`)

- Accessing Remote Server Fails

- Cannot Access the Administration Console

- Cannot Access a Server Application

- Server Will Not Start on Windows (Port Conflict)

- Port Conflicts Debugging Multiple Instances on the Same Server

- Two Server Instances Bind to Same Port on Windows

- Error: `System cannot find the path specified`

- Application Generates Error `persistence.support.JDODataStoreException`

- Using `asadmin set` Command May Produce Unexpected Results

- Cannot Undeploy Or Redeploy Application With Open Streams to Jar Files (Windows Only)

- Cannot Reinstall Application Server After Manual Deletion of Directories

- Cannot Produce a JVM Thread Dump After Server Crash

# `asadmin` `start-domain` Command Fails

The command `asadmin start-domain` fails with one of the following errors:

- Error: `CLI143 There is more than one domain...`

- Error: `Could Not Start Domain`

## Error: `CLI143 There is more than one domain...`

### Description

When issued with no arguments, the command `asadmin start-domai`n fails with the error:

    CLI143 There is more than one domain in C:\\Sun\\AppServer\\domains.
    Please use operand to specify the domain.
    CLI156 Could not start the domain null.

This error occurs when there is more than one domain in the domains directory, none of them is named `domain1,` and no domain is specified with the `start-domain` command.

### Solution

Specify the domain when issuing the `start-domain` command:

    asadmin start-domain domain1

## Error: `Could Not Start Domain`

### Description

This message comes from Application Server 8. The full message looks like either:

    Could not start the domain.
    There are no domains.

or

    Could not start the domain.
    No default domain. Need to enter a domain.

This error occurs when Application Server 8 is installed on the same system, and its `asadmin` command (at `/usr/sbin`) is found on the `PATH` before the `asadmin` command for Application Server 8 at install_dir`/bin`. The situation is especially likely to occur on Solaris/Linux systems when `.` is not specified as part of the `PATH` variable. Without `.` in the `PATH`, the `asadmin` command in `/usr/sbin` is found first, even when the current directory is install_dir`/bin`.

### Solution

Make sure install_dir`/bin` is in the `PATH` ahead of `/usr/sbin`, or that `.` is in the `PATH` ahead of `/usr/sbin` if you access `asadmin` by changing directories to install_dir`/bin`. Alternatively, if you do change to install_dir`/bin` to run `asadmin`, be sure to include`./` in the command name; for example:

    cd install_dir/bin
    ./asadmin

# Automatically Restarting a Domain or Node Agent on Reboot

If your domain or node agent is stopped unexpectedly (for example, if you need to restart your machine), you can configure your system to automatically restart the domain or node agent on reboot.

- Restarting Automatically on UNIX Platforms

- Restarting Automatically on the Microsoft Windows Platform

## Restarting Automatically on UNIX Platforms

### Restarting a Domain

To restart your domain on a UNIX platform, add a line containing the appropriate `asadmin start-domain` command to your `/etc/inittab` file. If you use `/etc/rc.local,` or your system’s equivalent, place a the desired `asadmin` command in `/etc/rc.local`.

For example, to restart `domain1` for an Troubleshooting Guide installed in the `/opt/SUNWappserver` directory, using a password file called `password.txt`, add the following line to `/etc/inittab` or `/etc/rc.local`:

    das:3:respawn:/opt/SUNWappserver/bin/asadmin start-domain --user admin
    --passwordfile /opt/SUNWappserver/password.txt domain1

Be sure to put the text on one line. The first three letters are a unique designator for the process and can be altered.

### Restarting a Node Agent

To restart a node agent, the syntax is similar. For example, to restart `agent1` for an Troubleshooting Guide installed in the `/opt/SUNWappserver` directory using a password file called `password.txt`, add the following line to `/etc/inittab` or `/etc/rc.local`:

    das:3:respawn:/opt/SUNWappserver/bin/asadmin start-node-agent --user admin
    --passwordfile /opt/SUNWappserver/password.txt agent1

## Restarting Automatically on the Microsoft Windows Platform

To restart automatically on Microsoft Windows, create a Windows Service. Use the `appservService.exe` and `appserverAgentService.exe` executables shipped with Sun Java System Application Server in conjunction with the Service Control command (`sc.exe`) provided by Microsoft.

- The `sc.exe` command comes with Windows XP and is either located in the `C:\\windows\\system32` directory or `C:\\winnt\\system32` directory.

- As of this writing, the Windows 2000 `sc.exe` is available for download at: `ftp://ftp.microsoft.com/reskit/win2000/sc.zip`. For more information on using `sc.exe`, see:

  `http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndllpro/html/msdn_scmslite.asp`.

  Use `appservService.exe` and `appservAgentService.exe` as follows:

      C:\\winnt\\system32\\sc.exe create service_name binPath= \\"fully_qualified_
      path_to_appservService.exe \\"fully_qualified_path_to_asadmin.bat
      start_command\\"
      \\"fully_qualified_path_to_asadmin.bat stop_command\\"" start= auto
      DisplayName= "display_name"

### Starting and Stopping a Domain

To create a service called `SunJavaSystemAppServer DOMAIN1` that starts and stops `domain1` using password file `C:\\Sun\\AppServer\\password.txt`, run the following command:

    C:\\windows\\system32\\sc.exe create domain1 binPath= "C:\\Sun\\AppServer\\
    lib\\appservService.exe \\"C:\\Sun\\AppServer\\bin\\asadmin.bat start-domain
    --user admin --passwordfile C:\\Sun\\AppServer\\password.txt domain1\\"
    \\"C:\\Sun\\AppServer\\bin\\asadmin.bat stop-domain domain1\\""
    start=auto DisplayName= "SunJavaSystemAppServer DOMAIN1"

### Starting and Stopping a Node Agent

To create a service that starts and stops the node agent `agent1`, run the following command:

    C:\\windows\\system32\\sc.exe create agent1 binPath= "C:\\Sun\\AppServer\\
    lib\\appservAgentService.exe \\"C:\\Sun\\AppServer\\bin\\asadmin.bat
    start-node-agent --user admin --passwordfile C:\\Sun\\AppServer\\
    password.txt agent1\\" \\"C:\\Sun\\AppServer\\bin\\asadmin.bat
    stop-node-agent agent1\\"" start=auto DisplayName="SJESAS_SE8.1 AGENT1"

Note –

The start and stop commands entered as part of the `binPath=` parameter must have the correct syntax. To test, run the commands from the command prompt. If the commands do not properly start or stop the domain or node agent, the service will not work correctly.

Also, do not use a mixture of `asadmin start` and `stop` commands and `service start` and `stops`. Mixing the two can cause the server status to be out of sync. For example, the service might not show that the component has started even though the component is not running. To avoid this situation, always use the `sc.exe` command to start and stop the component when using services.

### Security for Automatic Restarts

Handle the password and master password required when starting in one of the following ways:

- On Microsoft Windows, configure the service to ask the user for the password.

  - In the Services Control Panel, double-click the service you created.

  - In the Properties window, click the Log On tab.

  - Check “Allow service to interact with desktop” to prompt for the required passwords when starting the component.

    You have to log in to see the prompts, and entries are not echoed back as you type them. This method is the most secure way to use the services option, but user interaction is required before the service becomes available.

    If the “interact with desktop” option is not set, the service stays in a “start-pending” state and appears to hang. Kill the service process to recover from this state.

- On Windows or UNIX, create a domain using the `--savemasterpassword=true` option and create a password file to store the admin password. When starting the component, use the `--passwordfile` option to point to the file that contains the password. The admin password can also be added by using the `--password` option with the `asadmin start` command. Be aware that this method is less secure because the admin password is stored in clear text.

  For example:

  - Create a domain with a saved master password. Using this syntax, you are prompted for the admin password and master password:

        asadmin create-domain --adminport 4848 --adminuser admin
        --savemasterpassword=true --instanceport 8080 domain1

  - On Windows, create a service using a password file to populate the admin password:

        C:\\windows\\system32\\sc.exe create domain1 binPath=
         "C:\\Sun\\AppServer\\lib\\appservService.exe
         \\"C:\\Sun\\AppServer\\bin\\asadmin.bat start-domain --user admin
         --passwordfile C:\\Sun\\AppServer\\password.txt domain1\\"
         \\"C:\\Sun\\AppServer\\bin\\asadmin.bat stop-domain domain1\\""
         start= auto DisplayName= "SJESAS_PE8.1 DOMAIN1"

    The path to the password file `password.txt` is `C:\\Sun\\AppServer\\password.txt`. It contains the password in the following format:

        AS_ADMIN_password=password

    For example, for a password `adminadmin`:

        AS_ADMIN_password=adminadmin

  - On UNIX, use the `--passwordfile` option in the line you add to the `inittab` file:

        das:3:respawn:/opt/SUNWappserver/bin/asadmin start-domain
         --user admin --passwordfile /opt/SUNWappserver/password.txt domain1

    The path to the password file `password.txt` is `/opt/SUNWappserver/password.txt`. It contains the password in the following format:

        AS_ADMIN_password=password

    For example, for a password `adminadmin`:

        AS_ADMIN_password=adminadmin

- Creating a service using a password that is populated from a command line option:

      C:\\windows\\system32\\sc.exe create domain1 binPath= "C:\\Sun\\AppServer\\
      lib\\appservService.exe \\"C:\\Sun\\AppServer\\bin\\asadmin.bat start-domain
      --user admin --password adminadmin domain1\\" \\"C:\\Sun\\AppServer\\bin\\
      asadmin.bat stop-domain domain1\\"" start=auto
      DisplayName="SJESAS_PE8.1 DOMAIN1"

# Cannot Find Log Files

The following Application Server logs are useful for troubleshooting installation problems:

- Server log file — For troubleshooting server configuration and deployment problems

- HTTP server access logs — For troubleshooting HTTP server problems, and for tracing the activity of HTTP requests entering the Application Server instances

  Both the installation and uninstallation programs create log files and log all installation and uninstallation events to these files. The primary purpose of these log files is to provide troubleshooting information.

  In addition to installation program messages and log files, operating system utilities such as `pkginfo` and `showrev` on Solaris and `rpm` on Linux can be used to gather system information.

  Log file entries include information about the attempted action, the outcome of the action, and, if applicable, the cause of failure. The log files contain the followingtypes of message entries:

- INFO — These messages mark normal completion of a particular installation tasks.

- WARNING — These messages mark non-critical failures. Warning messages generally contain information about the cause and the nature of the failure, and also provide possible remedies.

- ERROR — These messages mark critical failures that cause installation or uninstallation status to be reported as Failed. Error messages generally provide detailed information about the nature and the cause of the problem that occurred.

  The domain-specific logs are located in install_dir`/domains/domain1/logs/`. Log files for the server installation in general are located as follows:

- Solaris, root user installation/uninstallation:

      /var/sadm/install/logs

- Solaris, non-root installation/uninstallation:

      /var/tmp

- Linux installation/uninstallation:

      /var/tmp

- Windows installation/uninstallation:

      %TEMP%

  Log file names are different for each product distribution, but are platform independent:

- Platform Edition, both SDK and Application Server distributions, main installation/uninstallation log files:

      Install_Application_Server_8PE_<timestamp\>.log
      Uninstall_Application_Server_8PE_<timestamp\>.log

- Platform Edition, Application Server only distribution, low-level installation/uninstallation log files:

      Sun_Java_System_Application_Server_Platform_Edition_install.B<timestamp\>
      Sun_Java_System_Application_Server_Platform_Edition_uninstall.B<timestamp\>

- Platform Edition, SDK distribution, low-level installation/uninstallation log files:

      Java_2_Platform__Enterprise_Edition_1.4_SDK_install.B<timestamp\>
      Java_2_Platform__Enterprise_Edition_1.4_SDK_uninstall.B<timestamp\>

- Enterprise Edition, main installation/uninstallation log files:

      Install_Application_Server_8EE_<timestamp\>.log
      Uninstall_Application_Server_8EE_<timestamp\>.log

- Enterprise Edition, low-level installation/uninstallation log files:

      Sun_Java_System_Application_Server_Enterprise_Edition_
      install.B<timestamp\>
      Sun_Java_System_Application_Server_Enterprise_Edition_
      uninstall.B<timestamp\>

# Accessing Local Server Fails (`http://localhost:8080`)

Things to check for this error include the following:

- Did the Server Start?

- Was the Server Started at the Expected Port?

## Did the Server Start?

### Description

If the console window is still open, the expected message is:

    Domain domain Started

where domain is the name of the default domain. This indicates that the default domain was started successfully.

If the console window is already closed, check for messages in the log file:

    install_dir/domains/domain1/logs/server.log

If startup was successful, the expected message is similar to that on the console, and appears at the end of the log file:

    [INFO][...][..][date&time][Application server startup complete .]

## Was the Server Started at the Expected Port?

### Description

The server might be running at a different port number than expected, either because it was intentionally installed there, or because another server was already running on the default port when the server was installed.

#### To determine which port number the server is actually using

##### Steps

1. Examine the server's configuration file:

       install_dir/domains/domain1/config/domain.xml

2. Find the `http-listener` element.

3. Inspect the value of the `port` attribute.

   Be sure to enter the correct port number when invoking the server.

   Note –

   The `server's` default port number is `8080`, however, there are a number of ways in which the expected value can change:

   - A different port number was specified during installation.

   - A previous installation exists.

   - If the specified port number is already taken by another application when the server is started, the port number rolls forward to the next available number. For example, if a server is already running on the default `8080` port, the new Application Server instance uses port number `8081`. If two servers are running, the port number rolls to `8082`, and so on.

# Accessing Remote Server Fails

When attempting to open the start page of the Application Server, the initial screen does not appear.

Things to check include the following:

- Is the Server Available Locally?

- Is the Proxy Setting Causing a Problem?

## Is the Server Available Locally?

### Description

If the server cannot be accessed from the web, but it is running locally, then the server is actually running.

### Solution

Verify that the server is running locally.

#### To verify that the server is running locally

##### Steps

1. Log on to the machine where the server is running.

2. Go to the local web page. For example, if `8080` is the default port, go to:

       http://localhost:8080/

   If the start page does appear, there is a problem with the web connection that prevents accessing the server remotely. If the start page does not appear, see Did the Server Start?

## Is the Proxy Setting Causing a Problem?

### Description

The server should be accessible directly from the host on which it is running (`localhost`); for example, using the default port, `8080`:

    http://localhost:8080/

### Solution

A server instance running on `localhost` may not be accessible if the server host machine is connected to the web through a proxy. To solve this problem, do one of the following:

- Set the browser to bypass the proxy server when accessing `localhost`. Refer to the browser's help system for information on how to do this.

- Use the fully-qualified host name or IP address of your system; for example:

      http://myhost.mydomain.com:8080/

Note –

To find the host name and domain for the `localhost` machine:

- On Microsoft Windows — On the desktop, right-click My Computer and select Properties from the pop-up menu. A System Properties dialog is displayed. Click Network Identification to see the computer name.

- On Solaris or Linux — Type `hostname` at the command prompt.

# Cannot Access the Administration Console

The Administration Console provides an interface for administrative functions. If the Administration Console is not accessible, it might be for one of several reasons.

- Is the Application Server Running?

- Is the Administration Console Running on the Expected Port?

- Is the Security Manager Disabled?

## Is the Application Server Running?

### Description

The server must be running before the Administration Console can be accessed.

### Solution

Review the information in Did the Server Start? to determine if the server is running.

## Is the Administration Console Running on the Expected Port?

### Description

The default port number for the EE and SE Administration Console is `4849`; for the PE Administration Console it is `4848`. Also note that the URL for the EE and SE console requires secure HTTP (`https://`servername`:4849`.), whereas the PE console uses standard HTTP (`http://`servername`:4848`). However, it could be running on a different port number than expected, either because it was intentionally installed there, or because that port was taken when the server was started.

### Solution

Refer to Was the Server Started at the Expected Port? for guidelines on verifying the port on which the Administration Console is running, and be sure to enter the correct port number and HTTP protocol when invoking the Administration Console.

## Is the Security Manager Disabled?

### Description

According to the J2EE 1.4 Specification, the Security Manager is not optional; it must be enabled in the Application Server. Since there is no configuration interface in the Application Server for disabling the Security Manager, it can only be disabled by directly modifying the `domain.xml` configuration file in such a way that the following line is removed:

    <jvm-option\>-Djava.security.policy=yourPolicy</jvm-option\>

### Solution

The `-Djava.security.policy=yourPolicy` option must be present in the `domain.xml` file to access the Administration Console.

# Cannot Access a Server Application

If a particular application cannot be accessed through the Application Server, some things to check include the following:

- Is the Application Server Running?

- Was Application Deployment Successful?

- Invalid User or Password When Using `Don’t Prompt` Option

- Administrator User Name or Password Not Known

## Is the Application Server Running?

### Description

If the Application Server is not running, applications will not be accessible.

### Solution

Review the information in Did the Server Start? to determine if the server is running. The server must be running before a server application can be accessed.

## Was Application Deployment Successful?

### Description

An application must be successfully deployed before it can be accessed.

### Solution

Check the server's log file:

    install_dir/domains/domain1/server.log

## Invalid User or Password When Using `Don’t Prompt` Option

You are getting the error, `Invalid user or password`, but you installed the system with the `Don't Prompt` option, so the password should be supplied automatically.

### Description

The correct password may not have been specified during installation, or it may not be passed when the domain is started.

### Solution

Check the password in the `.asadminprefs` file. On UNIX/Linux systems, it is in the home directory for the user under which the server was installed. On Windows, it is in `C:\\Documents and Settings\\`username. The contents look something like this:

    AS_ADMIN_USER=admin
    AS_ADMIN_PASSWORD=administrator

## Administrator User Name or Password Not Known

If you have forgotten the administrator user name, you can find it by inspecting the `.adminprefs` file, as described in the section above, or by inspecting the install_dir`/domains/domain1/config/keyfile`, where `domain1` is the default domain. For a different domain, substitute its name in the path.

If you have forgotten the administrator password, you will need to create a new user name-password pair by removing the user name and password, creating new ones, and restarting the server. (You will not be able to read the password, because it is encrypted in the keyfile.)

### To remove the user name and password completely

##### Steps

1. Stop the server, if it is currently running.

2. Change to the appropriate `WEB-INF` directory; for example:

       install_dir/lib/install/applications/adminapp/adminapp_war/WEB-INF

3. Comment out the entire `<security-constraint\>` element in the `web.xml` file.

   Do not delete the element, as you will be reenabling it later. This action disables security for command-line operations.

   Note –

   The commands will still expect a value for `--username` (or `-u`) and `--password` (or `-w`). But these can be dummy values, since the server side does not impose any security.

4. Start the server.

   At this point, the server does not have command-line security.

5. Run the following command:

       asadmin create-file-user --user <dummy\> --password <dummy\>
        --userpassword <new_secret\> --groups asadmin <new_user_id\>

   This command creates the following new entry:

       <install_dir\>/domains/domain1/config/keyfile

6. Uncomment the `<security-constraint\>` element in `web.xml` file.

7. Restart the server for the new user name-password to take effect.

   Note –

   When the server is started, any remote command-line operations will need `new_user_id` and `new_secret` as user name and password.

# Server Will Not Start on Windows (Port Conflict)

If a message similar to the following is displayed when starting the Application Server on Microsoft Windows, a server port conflict has occurred:

    Address already in use

This error occurs when another application is running on the Application Server port (default `8080`), or because a previous instance of the Application Server did not shut down cleanly.

Other things to check include the following:

- Is Another Application Running on the Server's Port?

- Has an Ungraceful Shutdown Occurred on a Previously Running Server?

## Is Another Application Running on the Server's Port?

If another application is using the server's port, stop the other application, then restart the Application Server.

Note –

The installer attempts to avoid port conflicts by choosing the next available port when the default port is in use—but that only works if application using the default port was running when the Application Server was installed.

## Has an Ungraceful Shutdown Occurred on a Previously Running Server?

Use the `asadmin stop-domain` command to stop the server, or explicitly kill the Java process and then restart the Application Server.

# Port Conflicts Debugging Multiple Instances on the Same Server

## Description

Port conflict errors can occur when debugging multiple instances on the same server that are part of the same cluster.

## Solution

Modify the `domain.xml` file to remove the `address` attribute from the `-Xrunjdwp` option in the `java-config` element for the cluster. This results in the JVM choosing a random debug port for the instance. The port number chosen for the instance is displayed in the server log when it is started; for example:

- Before:

      debug-options="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,
      suspend=n,address=9009"

- After:

      debug-options="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,
      suspend=n"

# Two Server Instances Bind to Same Port on Windows

## Description

This problem only occurs on Windows 2000/XP systems with the Application Server Enterprise Edition (not Platform Edition) software, and is due to a known Windows security flaw rather than a problem with the Application Server itself.

The problem occurs when two or more instances of the Application Server are created using the same port number for the `instanceport` option; for example:

    asadmin create-domain -adminport 5001 <options\> -instanceport 6001
     <domain\
    asadmin create-domain -adminport 5002 <options\> -instanceport 6001
     <domain\>

When the two domains are started on a UNIX/Linux system, a port conflict error is thrown and the second instance fails to start. However, when the two domains are started on Windows 2000/XP, no error is thrown, both server instances start, but only the first instance is accessible at the specified port. When that first server instance is subsequently shut down, the second instance then becomes accessible. Moreover, when both instance are running, the Windows `netstat` command shows the duplicate listeners as active, but only the first listener can respond to requests.

## Solution

Be sure to use unique port numbers for all server instances on Windows systems.

# Error: `System cannot find the path specified`

## Description

This error message occurs when attempting to start the server after deleting the J2SE directory that was specified during installation. This situation generally occurs after being informed during the install that the J2SE platform needs an upgrade, and the upgrade takes place after the Application Server installation.

## Solution 1

To use the new J2SE for all domains, change the `AS_JAVA` variable in `asenv.conf` (Solaris/Linux), or `asenv.bat` (Windows).

## Solution 2

The J2SE version can be changed on a per-domain basis by modifying the `java-home` attribute for the `java-config` element in the domain’s `domain.xml` file.

    <java-config ...
    java-home="path"
    ...\>

## Solution 3

A more time-intensive solution is to uninstall and then reinstall the server.

# Application Generates Error `persistence.support.JDODataStoreException`

## Description

A `com.sun.jdo.api.persistence.support.JDODataStoreException` is generated by an application, with a nested `java.sql.SQLException` indicating a duplicate primary key.

Even if the application is checking for a `CreateException`, it does not see one. The Enterprise JavaBeans specification requires a `CreateException` to be thrown only if two beans with the same primary key are created in the same transaction, so a `CreateException` is not thrown on transaction rollback if two entity beans with duplicate primary keys are created.

## Solution

If an application creates an entity bean with a duplicate primary key, check to see if the primary key exists by calling `findByPrimaryKey` before calling create.

# Using `asadmin set` Command May Produce Unexpected Results

## Description

Unexpected results are returned when setting variables in a command, such as:

    asadmin set name={$a-b}

In this case, `name` is set to `b`, not `{$a-b}` because the shell syntax `${a=b}` is interpreted as “if the variable `a` is unset, substitute the value `b`, otherwise substitute the value of `a`.” This is standard shell behavior. For example, consider the following:

    asadmin set default-config.http-service.http-listener.http-listener-1.port=
    ${http-listener-1-port}

In this case, `default-config.http-service.http-listener.http-listener-1.port` is set to `listener-1-port`, which is invalid.

# Cannot Undeploy Or Redeploy Application With Open Streams to Jar Files (Windows Only)

## Description

On Windows systems, after running an application, subsequent attempts to undeploy it or redeploy it throw exceptions about the server being unable to delete a file or rename a directory.

On Windows systems, an application may use `getClass().getResource` or `getResourceAsStream` methods to locate a resource inside the application, particularly in `jar` files that are in the application or accessible to it. If the streams remain open, subsequent attempts to redeploy or undeploy the application can fail. In addition, the Java runtime by default caches streams to `jar` files for performance reasons.

## Solution

Be sure to close streams opened by your applications. Also, if an application needs to be redeployed or undeployed repeatedly, and also needs to obtain a resource from a `jar` file using `getResource` or `getResourceAsStream`, consider using `getClass().getResource` which returns a URL object, then invoke the `url.setUseCaches` method to turn off caching for that `jar` file, and then use `url.getInputStream()` to obtain the stream.

Although turning off caching for accesses to the `jar` file can slow down performance, this approach does allow the application to be undeployed or redeployed. Note also that if the `getClass().getResourceAsStream` method is used instead, then the `jar` file in which the resource is located will be cached (this is the default Java runtime setting) and remain open until the server is stopped.

# Cannot Reinstall Application Server After Manual Deletion of Directories

## Description

If the Application Server directories are deleted manually rather than by means of the included `uninstall` the program, subsequent attempts to reinstall the Application Server in the same directory fail. This is because the installation directory information stored in `/tmp/productregistry` file remains even though the program directories have been removed.

## Solution 1

Remove Application Server directory information from the `<location\>` property entries in the `/tmp/productregistry` file; for example, change:

    <location\>/opt/SUNWappserver/jdk</location\>

to

    <location\></location\>

## Solution 2

Reinstall the Application Server in a different directory.

# Cannot Produce a JVM Thread Dump After Server Crash

## Description

If the Application Server crashes, the server dumps a core file and, by default, restarts with the `-Xrs` flag, which prevents the dump of a JVM thread dump.

## Solution

### To enable a JVM thread dump

##### Steps

1. Comment out the `-Xrs` flag in the `server.xml` file for the Application Server.

2. Kill the server process (`kill -3` on UNIX; Ctrl+Break on Windows).

- Previous: Chapter 1 Overview
- Next: Chapter 3 Security Problems

- © 2010, Oracle Corporation and/or its affiliates