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The parent POM in the releng project of an application created via e4 JavaFX application wizard contains the tycho-compiler-plugin configuration that points out to 1.7 source and target compiler compliance level. Since the projects are created pointing to a JavaSE-1.8 JRE System Library and it is suggested to use Java 8 (otherwise several features doesn't work) I suggest to update these settings also to 1.8. I ran into that issue when I tried to build an application using Maven where I use lambdas. While it compiles and opens correctly in the IDE, the Maven build fails complaining about lambdas are only 1.8 compliant.