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Problem with dynamic class generation...

3 replies on 1 page. Most recent reply: May 19, 2004 2:56 AM by Not a chance

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Flat View: This topic has 3 replies on 1 page

Not a chance

Posts: 2
Nickname: iaiken
Registered: May, 2004

Problem with dynamic class generation...

Posted: May 14, 2004 10:23 AM

I am using a service factory to instantiate objects and classes for a web application in tomcat.

It happens when I try to instantiate a data access object as follows.

public MessageService() {
appContainer = ApplicationContainer.getInstance();
messageManager = appContainer.getMessageManager();
messageDAO = new MessageDAO(); << Exception here...
}

java.lang.ClassFormatError: com/theIMO/inui/dao/MessageDAO (Code attribute is absent in method that is not abstract or native)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoade r.java:1643)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:9 37)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1 372)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1 254)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at com.theIMO.inui.service.MessageService.(MessageService.java:40)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessor Impl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructor AccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:306)
at java.lang.Class.newInstance(Class.java:259)
at com.theIMO.inui.service.ServiceFactory.createService(ServiceFactory.java:39)
at com.theIMO.inui.actions.BaseAction.getService(BaseAction.java:34)
at com.theIMO.inui.actions.AddMessageAction.execute(AddMessageAction.java:66)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor .java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain .java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java: 243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java: 190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.jav a:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:17 4)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:102 7)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
at java.lang.Thread.run(Thread.java:536)

Daniel Ray

Posts: 53
Nickname: budoray
Registered: Oct, 2002

Re: Problem with dynamic class generation...

Posted: May 18, 2004 9:19 PM

Are you using 1.3? Try 'cleaning' your class files and recompile.

Daniel Ray

Posts: 53
Nickname: budoray
Registered: Oct, 2002

Re: Problem with dynamic class generation...

Posted: May 18, 2004 9:22 PM

Also, what's on this line

MessageService.java:40

Not a chance

Posts: 2
Nickname: iaiken
Registered: May, 2004

Re: Problem with dynamic class generation...

Posted: May 19, 2004 2:56 AM

I fixed this problem the other day, it turned out that that last method of my DAO was missing a method body. The compiler then got angry because it wanted it declared abstract.

However, thanks for your concideration.

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