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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.

Solutions on the web

via GitHub by HosiYuki
, 1 year ago
via Coderanch by Siegfried Heintze, 1 year ago
via Stack Overflow by Unknown author, 2 years ago
via Google Groups by Rajith Muditha Attapattu, 1 year ago
via Stack Overflow by MPH
, 2 years ago
java.lang.NoClassDefFoundError: org/apache/avro/io/DatumReader at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors( at java.lang.Class.getDeclaredConstructors( at org.apache.reef.tang.util.ReflectionUtilities.getNamedParameterTargetOrNull( at at at at at at at at at at at at at org.apache.reef.runtime.common.REEFLauncher.getREEFLauncher( at org.apache.reef.runtime.common.REEFLauncher.main( by: java.lang.ClassNotFoundException: at$ at$ at Method) at at java.lang.ClassLoader.loadClass( at sun.misc.Launcher$AppClassLoader.loadClass( at java.lang.ClassLoader.loadClass( ... 18 more