DWR

[STS] DWR namespace handler fails with ClassNotFoundException from the users mailing list:

After upgrading to SpringSource Tool Suite (SpringIDE) 2.5.2, DWR throws ClassNotFoundException on project validation if "Load NamespaceHandlers and XSDs from project's classpath" is enabled. I have looked into DWR namespace handler code and it uses thread context class loader on line 338 (2.0.6 source) (through ClassUtils.forName):

beanCreator.addPropertyValue("beanClass", ClassUtils.forName(beanClassName));

Problem is that while namespace handler is loaded within SpringIDE, the thread context class loader is eclipse default class loader. Therefore DWR namespace handler is unable to load classes from project.

My question is: are you aware of that issue? What would you advice in that case?

Best regards,
Piotr Tomiak,
Genuitec LLC


Stack trace of the exception:

org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from file [/home/piotr/Workspaces/MyEclipse Blue Edition 9/DWRSpringJPAExample/WebRoot/WEB-INF/applicationContext.xml]; nested exception is org.springframework.beans.FatalBeanException: Unable to create DWR bean creator for 'carViewer'.; nested exception is java.lang.ClassNotFoundException: com.myeclipseide.examples.dwrspring.bean.CarViewer
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
at org.springframework.ide.eclipse.beans.core.internal.model.BeansConfig$2.loadBeanDefinitions(BeansConfig.java:374)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
at org.springframework.ide.eclipse.beans.core.internal.model.BeansConfig$3.call(BeansConfig.java:418)
at org.springframework.ide.eclipse.beans.core.internal.model.BeansConfig$3.call(BeansConfig.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Caused by: org.springframework.beans.FatalBeanException: Unable to create DWR bean creator for 'carViewer'.; nested exception is java.lang.ClassNotFoundException: com.myeclipseide.examples.dwrspring.bean.CarViewer
at org.directwebremoting.spring.DwrNamespaceHandler$RemoteBeanDefinitionDecorator.decorate(DwrNamespaceHandler.java:342)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.decorate(NamespaceHandlerSupport.java:97)
at org.springframework.ide.eclipse.beans.core.internal.model.namespaces.DelegatingNamespaceHandlerResolver$ElementTrackingNamespaceHandler.decorate(DelegatingNamespaceHandlerResolver.java:190)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateIfRequired(BeanDefinitionParserDelegate.java:1372)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1359)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1339)
at org.springframework.ide.eclipse.beans.core.internal.model.BeansConfig$ToolingFriendlyBeanDefinitionDocumentReader.processBeanDefinition(BeansConfig.java:1214)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:153)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:132)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
at org.springframework.ide.eclipse.beans.core.internal.model.BeansConfig$2.registerBeanDefinitions(BeansConfig.java:388)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
... 13 more

Caused by: java.lang.ClassNotFoundException: com.myeclipseide.examples.dwrspring.bean.CarViewer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at org.eclipse.core.runtime.internal.adaptor.ContextFinder.loadClass(ContextFinder.java:129)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:257)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:204)
at org.directwebremoting.spring.DwrNamespaceHandler$RemoteBeanDefinitionDecorator.decorate(DwrNamespaceHandler.java:338)
... 25 more