#21 0.21.1 does not run

[Anonymous]

I downloaded the .jar file. When I click on it, it returns "Could not find the main class." - I opened the file and saw that there are two MANIFEST.MF files (same name) in the same directory. Very strange!

[Nobody/Anonymous]

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I had same problem on windows, on a shared computer at school.

[Alan Gutierrez]

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Unable to run on OS X. With this error:

[alan@velenje Inbox]$ java -jar com.horstmann.violet-0.21.1.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

[Alan Gutierrez]

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Two manifests is not so strange. If you are building from an ANT file, either include the MANIFEST in the copy, or specify it as an attribute, but do not do both.