Tomcat dont execute default version java in linux machine.
to view what version java use proccess tomcat type this
#ps -ef | grep tomcat
tomcat7 13692 1 1 10:57 ? 00:00:07 /usr/lib/jvm/default-java/bin/java -Djava.util.logging.config.file=/var/lib/tomcat7/conf/logging.properties -Djava.awt.headless=true -Xmx128m -XX:+UseConcMarkSweepGC -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/share/tomcat7/endorsed -classpath /usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-juli.jar -Dcatalina.base=/var/lib/tomcat7 -Dcatalina.home=/usr/share/tomcat7 -Djava.io.tmpdir=/tmp/tomcat7-tomcat7-tmp org.apache.catalina.startup.Bootstrap start
To view default java version
#java -version
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
and execute default java
#/usr/lib/jvm/default-java/bin/java -version
java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.5) (6b27-1.12.5-0ubuntu0.12.04.1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
#update-java-alternatives -l
j2sdk1.6-oracle 315 /usr/lib/jvm/j2sdk1.6-oracle
java-1.6.0-openjdk-amd64 1061 /usr/lib/jvm/java-1.6.0-openjdk-amd64
java-1.7.0-openjdk-amd64 1051 /usr/lib/jvm/java-1.7.0-openjdk-amd64
java-7-oracle 1062 /usr/lib/jvm/java-7-oracle
show soft link to java 1.6
#/usr/lib/jvm/ ls -la
default-java -> java-1.6.0-openjdk-amd64
remove soft link to 1.6 and create a new link 1.7
# unlink default-java
# ln -f -s java-7-oracle /usr/lib/jvm/default-java
show new link to 1.7
#/usr/lib/jvm/ ls -la
default-java -> java-7-oracle
