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    Expert tip

    The server rejects all jars that already belong to the server runtime (such as tomcat-**.jar, servlet**.jar). Consider substituting the CORS filter you're using for this one:

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    This is thrown when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath. Make sure poi-ooxml library jar is added to your project's build path and you are using the latest version.

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java.lang.NoClassDefFoundError: org/springframework/mock/web/MockAsyncContext at java.lang.Class.privateGetDeclaredMethods( at java.lang.Class.getDeclaredMethods( at org.codehaus.groovy.util.LazyReference.getLocked( at org.codehaus.groovy.util.LazyReference.get( at grails.test.spock.IntegrationSpec.initRequestEnv(IntegrationSpec.groovy:96) at grails.test.spock.IntegrationSpec.setup(IntegrationSpec.groovy:62)Caused by: java.lang.ClassNotFoundException: org.springframework.mock.web.MockAsyncContext at$ at$ at at java.lang.ClassLoader.loadClass( ... 6 more