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    Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

Solutions on the web

via GitHub by pascalgrimaud
, 1 year ago
io/netty/channel/socket/DuplexChannel
via Stack Overflow by John S
, 11 months ago
io/netty/channel/CombinedChannelDuplexHandler
via GitHub by teaforthecat
, 1 year ago
lux_data_io/IO (wrong name: lux_data_io/io)
via Google Groups by Pasquale Iodice, 1 year ago
io/lumify/core/cmdline/CommandLineBase*
via Google Groups by Shishir Kumar, 1 year ago
io/lumify/core/cmdline/CommandLineBase
java.lang.NoClassDefFoundError: io/netty/channel/socket/DuplexChannel	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)	at java.security.AccessController.doPrivileged(Native Method)