Package quartz appears to be using Java generics, but generates class files in format older than 49.0, which corresponds to J2SE 5.0, in which generics were introduced. Please update this package to generate classes in format 49.0 or above. This corresponds to -target 1.5 option of javac (or ecj). For more information, see bug #842394
Additional detail: there appears to be a single class in quartz.jar fitting this description: org/quartz/core/QuartzScheduler_Stub.class: compiled Java class data, version 45.3 This class is generated by the rmic-maven-plugin, which compiles the class using sun.rmi.rmic.Main in openjdk's tools.jar. AFAICT, the doCompile method in this class hardcodes majorVersion and minorVersion to 45 and 3, respectively. http://hg.openjdk.java.net/build-infra/jdk7/jdk/file/f097ca2434b1/src/share/classes/sun/rmi/rmic/Main.java (see lines 519-520) I don't see how I can reasonably change this.