java.lang.NoClassDefFoundError: io/netty/util/concurrent/DefaultPromise$2

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If JVM throws ClassNotFoundException the class is not found in classpath. Seems you are missing hibernate dependency in your project set up. Try downloading hibernate-core.jar and add to your project classpath.

Solutions on the web

via GitHub by Unisay
, 1 year ago
io/netty/util/concurrent/DefaultPromise$2
via GitHub by basovink
, 3 months ago
io/netty/util/concurrent/DefaultPromise$2
via Stack Overflow by Thala
, 1 year ago
via GitHub by darkfrog26
, 8 months ago
io/netty/util/concurrent/DefaultPromise$1
java.lang.ClassNotFoundException: io.netty.util.concurrent.DefaultPromise$2
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)

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