java.lang.NoClassDefFoundError: This exception has no message.

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Check if the version of resteasy is using is the same JBoss is using. To find it out, search for resteasy-jaxrs* in JBoss/Wildfly directory and at your pom.xml.

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java.lang.NoClassDefFoundError:
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:213)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134)
at org.jboss.as.connector.subsystems.datasources.DsParser$1.(DsParser.java:800)
at org.jboss.as.connector.subsystems.datasources.DsParser.parse(DsParser.java:171)
at org.jboss.as.connector.subsystems.datasources.DataSourcesExtension$DataSourceSubsystemParser.readElement(DataSourcesExtension.java:628)
at org.jboss.as.connector.subsystems.datasources.DataSourcesExtension$DataSourceSubsystemParser.readElement(DataSourcesExtension.java:193)
at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:110)
at org.jboss.staxmapper.XMLExtendedStreamReaderImpl.handleAny(XMLExtendedStreamReaderImpl.java:69)
at org.jboss.as.server.parsing.StandaloneXml.parseServerProfile(StandaloneXml.java:1131)
at org.jboss.as.server.parsing.StandaloneXml.readServerElement_1_4(StandaloneXml.java:458)
at org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:145)
at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:110)
at org.jboss.as.server.ServerService.boot(ServerService.java:331)
at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:256)
at java.lang.Thread.run(Thread.java:745)

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