Hi,
Thank you very much for your reply.
When I use the tomcat bundled with jwsdp1.3 the NPE does not occur,
instead I get a java.net.ConnectException( Connection refused: connect) with
30 concurrent clients. With 25 concurrent clients everything runs ok, no NPE
and no java.net.ConnectException. With tomcat 5.0.19 I never get a
java.net.ConnectException, but I get a NPE when there are more than 10
simultaneous clients running.
By the way, I simulate the concurrent running clients using a JUnit
TestCase which runs in a separate JVM from Tomcat.
Thanks,
Jair Jr
----- Original Message -----
From: "kathy walsh" <Kathleen.Walsh_at_Sun.COM>
To: <users_at_jax-rpc.dev.java.net>
Sent: Monday, April 05, 2004 9:32 AM
Subject: Re: web service serialization error when server under heavy load
Hi-
What happens when you use the tomcat bundled with the jwsdp1.3-
Does the NPE still occur?
This would be useful to know-
Jair da Silva Ferreira Júnior wrote:
>Hi everybody,
> I am using j2sdk1.4.2, JWSDP 1.3, Windows XP Professional (sp1) and Tomcat
>5.0.19 as the servlet/jsp container (I don't use the Tomcat bundled with
>JWSDP1.3).
> I am developing a web service using JAX-RPC which is accessed by a Java
>Static Stub Client.
> The problem is I keep getting a serialization error caused by a
>NullPointerException on the server side (web service endpoint) when many
>clients (about 30) try to access the web service simultaneosly. If there is
>a small number of concurrent accesses (about 10) the problem does not
happen
>and everything works fine. The strangest thing is that my endpoint
>implementation class successfuly processes all the requests (I logged the
>implementation class execution and no exception is throw and the expected
>results are generated). It looks like JAX-RPC is not able to correctly
>serialize my response objects (SearchResult and SearchResultEntry) and send
>it back to the client when the server is under heavy load.
> I updated the JAX-RPC implementation in JWSDP 1.3 using the JAX-RPC 1.1_03
>Patch (replacing the jaxrpc-impl.jar file as instructed in the patch README
>file) hoping it would solve the problem, but the problem remained the same.
> I am attaching the exception stack trace and the generated WSDL file in
the
>end of this email to help you better understand the problem.
> Am I doing something wrong? Any help would be really appreciated.
> Thank you very much for your help.
>
>Thanks,
> Jair Jr
>
>=================
>exception stack trace
>=================
>03/04/2004 11:06:57 com.sun.xml.rpc.server.StreamingHandler handle
>SEVERE: serialization error: java.lang.NullPointerException
>serialization error: java.lang.NullPointerException
> at
>com.sun.xml.rpc.encoding.ObjectSerializerBase.serialize(ObjectSerializerBas
e
>.java:113)
> at
>com.sun.xml.rpc.encoding.ReferenceableSerializerImpl.serializeInstance(Refe
r
>enceableSerializerImpl.java:194)
> at
>com.sun.xml.rpc.encoding.SOAPSerializationContext.serializeMultiRefObjects(
S
>OAPSerializationContext.java:94)
> at
>com.sun.xml.rpc.server.StreamingHandler.writeResponse(StreamingHandler.java
:
>603)
> at
>com.sun.xml.rpc.server.StreamingHandler.handle(StreamingHandler.java:282)
> at
>com.sun.xml.rpc.server.http.JAXRPCServletDelegate.doPost(JAXRPCServletDeleg
a
>te.java:316)
> at com.sun.xml.rpc.server.http.JAXRPCServlet.doPost(JAXRPCServlet.java:69)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
> at
>org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applicatio
n
>FilterChain.java:284)
> at
>org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterC
h
>ain.java:204)
> at
>org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.j
a
>va:257)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContex
t
>Valve.java:245)
> at
>org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.j
a
>va:199)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:18
4
>)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:16
4
>)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:149)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.jav
a
>:156)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
> at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
> at
>org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
> at
>org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConn
e
>ction(Http11Protocol.java:732)
> at
>org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
> at
>org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.ja
v
>a:688)
> at java.lang.Thread.run(Thread.java:534)
>
>CAUSE:
>
>java.lang.NullPointerException
> at
>com.iespa.searchengine.server.SearchResultEntry__IESPASearch__SOAPSerialize
r
>.doSerializeInstance(SearchResultEntry__IESPASearch__SOAPSerializer.java:86
)
> at
>com.sun.xml.rpc.encoding.ObjectSerializerBase.serialize(ObjectSerializerBas
e
>.java:102)
> at
>com.sun.xml.rpc.encoding.ReferenceableSerializerImpl.serializeInstance(Refe
r
>enceableSerializerImpl.java:194)
> at
>com.sun.xml.rpc.encoding.SOAPSerializationContext.serializeMultiRefObjects(
S
>OAPSerializationContext.java:94)
> at
>com.sun.xml.rpc.server.StreamingHandler.writeResponse(StreamingHandler.java
:
>603)
> at
>com.sun.xml.rpc.server.StreamingHandler.handle(StreamingHandler.java:282)
> at
>com.sun.xml.rpc.server.http.JAXRPCServletDelegate.doPost(JAXRPCServletDeleg
a
>te.java:316)
> at com.sun.xml.rpc.server.http.JAXRPCServlet.doPost(JAXRPCServlet.java:69)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
> at
>org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applicatio
n
>FilterChain.java:284)
> at
>org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterC
h
>ain.java:204)
> at
>org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.j
a
>va:257)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContex
t
>Valve.java:245)
> at
>org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.j
a
>va:199)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:18
4
>)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:16
4
>)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:149)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at
>org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.jav
a
>:156)
> at
>org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveConte
x
>t.java:151)
> at
>org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
> at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
> at
>org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
> at
>org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConn
e
>ction(Http11Protocol.java:732)
> at
>org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
> at
>org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.ja
v
>a:688)
> at java.lang.Thread.run(Thread.java:534)
>
>=============
>WSDL File
>=============
><?xml version="1.0" encoding="UTF-8"?>
>
><definitions name="IESPASearchService" targetNamespace="urn:Foo"
>xmlns:tns="urn:Foo" xmlns="http://schemas.xmlsoap.org/wsdl/"
>xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">
> <types>
> <schema targetNamespace="http://java.sun.com/jax-rpc-ri/internal"
>xmlns:tns="http://java.sun.com/jax-rpc-ri/internal"
>xmlns:soap11-enc="http://schemas.xmlsoap.org/soap/encoding/"
>xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
>xmlns="http://www.w3.org/2001/XMLSchema">
> <import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
> <import namespace="urn:Foo"/>
> <complexType name="collection">
> <complexContent>
> <restriction base="soap11-enc:Array">
> <attribute ref="soap11-enc:arrayType"
>wsdl:arrayType="anyType[]"/></restriction></complexContent></complexType></
s
>chema>
> <schema targetNamespace="urn:Foo" xmlns:tns="urn:Foo"
>xmlns:soap11-enc="http://schemas.xmlsoap.org/soap/encoding/"
>xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>xmlns:ns2="http://java.sun.com/jax-rpc-ri/internal"
>xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
>xmlns="http://www.w3.org/2001/XMLSchema">
> <import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
> <import namespace="http://java.sun.com/jax-rpc-ri/internal"/>
> <complexType name="SearchParameter">
> <sequence>
> <element name="entriesCount" type="int"/>
> <element name="firstEntryIndex" type="int"/>
> <element name="search" type="string"/>
> <element name="searchMode"
>type="string"/></sequence></complexType>
> <complexType name="SearchResult">
> <sequence>
> <element name="entries" type="ns2:collection"/>
> <element name="firstEntryIndex" type="int"/>
> <element name="lastEntryIndex" type="int"/>
> <element name="next" type="boolean"/>
> <element name="nextFirstEntryIndex" type="int"/>
> <element name="previous" type="boolean"/>
> <element name="previousFirstEntryIndex" type="int"/>
> <element name="totalEntriesCount"
>type="int"/></sequence></complexType>
> <complexType name="SearchException">
> <sequence>
> <element name="message" type="string"
>nillable="true"/></sequence></complexType>
> <complexType name="SearchResultEntry">
> <sequence>
> <element name="name" type="string"/>
> <element name="url"
>type="string"/></sequence></complexType></schema></types>
> <message name="LibraryIF_search">
> <part name="SearchParameter_1" type="tns:SearchParameter"/></message>
> <message name="LibraryIF_searchResponse">
> <part name="result" type="tns:SearchResult"/></message>
> <message name="SearchException">
> <part name="SearchException" type="tns:SearchException"/></message>
> <portType name="LibraryIF">
> <operation name="search" parameterOrder="SearchParameter_1">
> <input message="tns:LibraryIF_search"/>
> <output message="tns:LibraryIF_searchResponse"/>
> <fault name="SearchException"
>message="tns:SearchException"/></operation></portType>
> <binding name="LibraryIFBinding" type="tns:LibraryIF">
> <soap:binding transport="http://schemas.xmlsoap.org/soap/http"
>style="rpc"/>
> <operation name="search">
> <soap:operation soapAction=""/>
> <input>
> <soap:body
encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"
>use="encoded" namespace="urn:Foo"/></input>
> <output>
> <soap:body
encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"
>use="encoded" namespace="urn:Foo"/></output>
> <fault name="SearchException">
> <soap:fault name="SearchException"
>encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" use="encoded"
>namespace="urn:Foo"/></fault></operation></binding>
> <service name="IESPASearchService">
> <port name="LibraryIFPort" binding="tns:LibraryIFBinding">
> <soap:address
>location="REPLACE_WITH_ACTUAL_URL"/></port></service></definitions>
>
>
>
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