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ClassLoader error when importing or exporting BPMN diagrams with WebLogic

warning

WebLogic

Problem​

Under some circumstances, when importing or exporting a BPMN file using WebLogic, you may run into ClassLoader errors. You may get an error similar to:

2018-05-24 10:24:25 ERROR GlobalExceptionResolver - Handler dispatch failed; nested exception is java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "org.apache.xpath.jaxp.XPathImpl.getNamespaceContext()Ljavax/xml/namespace/NamespaceContext;" the class loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader) of the current class, org/apache/xpath/jaxp/XPathImpl, and the class loader (instance of <bootloader>) for interface javax/xml/xpath/XPath have different Class objects for the type javax/xml/namespace/NamespaceContext used in the signature org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "org.apache.xpath.jaxp.XPathImpl.getNamespaceContext()Ljavax/xml/namespace/NamespaceContext;" the class loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader) of the current class, org/apache/xpath/jaxp/XPathImpl, and the class loader (instance of <bootloader>) for interface javax/xml/xpath/XPath have different Class objects for the type javax/xml/namespace/NamespaceContext used in the signature at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1006) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

Solution​

Because of the classloader issues the following files will need to be removed from the iGrafxWebApp.war file that is located inside the EAR file:

WEB-INF/lib/stax-api.jar