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  1. ,
    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: https://goo.gl/ctQ7Fs

  2. ,

    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 Coderanch by abhi singhal, 1 year ago
javax/transaction/Synchronization
via Coderanch by Sakthi Siva, 1 year ago
java.lang.NoClassDefFoundError: javax/transaction/Synchronization at org.hibernate.impl.SessionImpl.<init>(SessionImpl.java:213) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:473) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:497) at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:505) at com.mkyong.common.App.main(App.java:13)Caused by: java.lang.ClassNotFoundException: javax.transaction.Synchronization at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) ... 5 more