Problems running cassandra 1.1.9 with Java Oracle 7

Question

I am new to cassandra and I am trying to make an installation of cassandra 1.1.9 with JAVA oracle 7 but I am getting the following error:

cassandra -f
    xss =  -ea -javaagent:/usr/share/cassandra/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms1862M -Xmx1862M -Xmn200M -XX:+HeapDumpOnOutOfMemoryError -Xss256k
    Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/cassandra/service/CassandraDaemon : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

For what I read in How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version its an incompatibility between the source and the Java version but to me it seems to be okey:

ubuntu@localhost:~$ java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode) 

Anyone knows what I might be missing?

Answer 1

at the beginning of shell script that start cassandra add

export JAVA_HOME=/path/to/java_v7
export PATH=$JAVA_HOME/bin:$PATH

and it should help