openjdk - java.lang.UnsupportedClassVersionError: com/crawljax/cli/JarRunner : Unsupported major.minor version 51.0 -

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i have downloaded program:

wget https://github.com/crawljax/crawljax/releases/download/crawljax-3.6/crawljax-cli-3.6.zip

unzip it:

unzip crawljax-cli-3.6.zip

get in folder , run:

java -jar crawljax-cli-3.6.jar

this error get:

java -jar crawljax-cli-3.6.jar exception in thread "main" java.lang.unsupportedclassversionerror: com/crawljax/cli/jarrunner : unsupported major.minor version 51.0 @ java.lang.classloader.defineclass1(native method) @ java.lang.classloader.defineclass(classloader.java:643) @ java.security.secureclassloader.defineclass(secureclassloader.java:142) @ java.net.urlclassloader.defineclass(urlclassloader.java:277) @ java.net.urlclassloader.access$000(urlclassloader.java:73) @ java.net.urlclassloader$1.run(urlclassloader.java:212) @ java.security.accesscontroller.doprivileged(native method) @ java.net.urlclassloader.findclass(urlclassloader.java:205) @ java.lang.classloader.loadclass(classloader.java:323) @ sun.misc.launcher$appclassloader.loadclass(launcher.java:294) @ java.lang.classloader.loadclass(classloader.java:268) not find main class: com.crawljax.cli.jarrunner. program exit.

i have done this:

apt-get install default-jre apt-get install default-jdk

but same error

my version of java: 

javac -version

javac 1.6.0_35

java -version

java version "1.6.0_35" openjdk runtime environment (icedtea6 1.13.7) (6b35-1.13.7-1~deb7u1) openjdk 64-bit server vm (build 23.25-b01, mixed mode)

i have read because have compiled higher version 1 executing on jvm, have no source code here recompile, have .jar.

as noted, attempting run jar compiled java 7 jre 6. install jre java 7:

apt-get install openjdk-7-jre  apt-get install openjdk-7-jdk # measures

and set default jre:

update-alternatives --config java # , select java 7

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