java.lang.NoClassDefFoundError：Tomcat中的com / ibm / mq / MQException

Question

I am running a dynamic web project, but am encountering the following errors from Tomcat:

Caused by: java.lang.NoClassDefFoundError: com/ibm/mq/MQException
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Unknown Source)
    at java.lang.Class.getDeclaredFields(Unknown Source)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:261)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5269)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: com.ibm.mq.MQException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    ... 20 more

I have the com.ibm.mq.jar added as an external jar. Does anyone know what's wrong?

Answer 1

You need to mark that jar as needing to be deployed from your project's Deployment Assembly property page. By default, only the jars physically in the WEB-INF/lib folder will be deployed to the server.

Answer 2

First of all, you need more than just com.ibm.mq.jar file to connect to a remote queue manager.

If you are using WMQ v6.0 or lower then you need the following MQ JAR files:

• com.ibm.mq.jar
• connector.jar

If you are using WMQ v7.0, v7.1, v7.5 or higher then you need the following MQ JAR files:

• com.ibm.mq.jar
• connector.jar
• com.ibm.mq.commonservices.jar
• com.ibm.mq.headers.jar
• com.ibm.mq.jmqi.jar

If you are using JMS in your application then you also need:

• com.ibm.mqjms.jar
• jms.jar

Are you using MQ JNDI? If so, also add the jndi.jar file too.

This is the standard RTM, as it is well documented.