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When you have both Java 6 and Java 7 installed, the default Java may not be Java 7.
Do this by typing java -version, and check the output.
- If the output is like "java version "1.7.0_xx", then the default Java is Java 7, which is good.
- If the output is like "java version "1.6.0_xx", then the default Java is Java 6, we need to configure default Java to Java 7.
If the default Java is Java 6, then do
On Debian/Ubuntu:
sudo update-alternatives --config java
On CentOS/RHEL:
sudo alternatives --config java
The above command will ask you to choose one of the installed Java versions as default. You should choose Java 7 here.
After that, re-run java -version to make sure the change has taken effect.