JAVA_HOME wrongly set in ampassword tool

In spite I've JAVA_HOME exported and correctly set in my environment, when I run the tools setup script, the ampassword script ends up with a wrong JAVA_HOME value (which doesn't exist by the way):

1. sudo su tomcat -c 'cd /opt/openam/OpenAMTools/ssoAdminTools && export JAVA_HOME=/opt/java/jdk1.7.0_51/jre && ./setup -p /opt/openam'
   + '[' -z /opt/java/jdk1.7.0_51/jre ']'
   + '[' '!' -x /opt/java/jdk1.7.0_51/jre/bin/java ']'
   ++ which awk
   + AWK=/bin/awk
   + '[' -z /bin/awk ']'
   ++ /bin/awk '-F"' ' {print $2}

   '
   ++ /opt/java/jdk1.7.0_51/jre/bin/java -version
   + JAVA_VER=1.7.0_51
   + case $JAVA_VER in
   + '[' -p = -h -o -p = --help ']'
   + '[' -p = -l -o -p = --log ']'
   + '[' -p = -d -o -p = --debug ']'
   + '[' -p = -p -o -p = --path ']'
   + path_AMConfig=/opt/openam
   + '[' '' = -l -o '' = --log ']'
   + '[' '' = -d -o '' = --debug ']'
   + '[' '' = -p -o '' = --path ']'
   + '[' '' = -l -o '' = --log ']'
   + '[' '' = -d -o '' = --debug ']'
   + '[' '' = -p -o '' = --path ']'
   + CLASSPATH=
   + CLASSPATH=:lib/opendj-server-2.6.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar:lib/openam-shared-11.0.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar:lib/openam-shared-11.0.0.jar:lib/openam-dtd-schema-11.0.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar:lib/openam-shared-11.0.0.jar:lib/openam-dtd-schema-11.0.0.jar:lib/openam-rest-11.0.0.jar
   + CLASSPATH=:lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar:lib/openam-shared-11.0.0.jar:lib/openam-dtd-schema-11.0.0.jar:lib/openam-rest-11.0.0.jar:resources
   + /opt/java/jdk1.7.0_51/jre/bin/java -Dload.config=yes -Dhelp.print= -Dpath.AMConfig=/opt/openam -Dpath.debug= -Dpath.log= -cp :lib/opendj-server-2.6.0.jar:lib/forgerock-util-1.1.0.jar:lib/json-20090211.jar:lib/xalan-2.7.1.jar:lib/xercesImpl-2.10.0.jar:lib/xml-apis-1.4.01.jar:lib/xmlsec-1.3.0.jar:lib/openam-core-11.0.0.jar:lib/openam-shared-11.0.0.jar:lib/openam-dtd-schema-11.0.0.jar:lib/openam-rest-11.0.0.jar:resources com.sun.identity.tools.bundles.Main
   Les scripts sont correctement configurés dans le répertoire : /opt/openam/OpenAMTools/ssoAdminTools/opensso
   Le répertoire de débogage est /opt/openam/OpenAMTools/ssoAdminTools/debug.
   Le répertoire des journaux est /opt/openam/OpenAMTools/ssoAdminTools/log.
   La version de ce tools.zip est : OpenAM 11.0.0
   La version de votre instance de serveur est : OpenAM 11.0.0 (2013-December-12 17:16)

2. grep ^JAVA_HOME /opt/openam/OpenAMTools/ssoAdminTools/opensso/bin/ampassword
   JAVA_HOME="/usr/lib/jvm/java-6-openjdk-amd64/jre"

So, it makaes the ampassword script fails:

/opt/openam/OpenAMTools/ssoAdminTools/opensso/bin/ampassword: line 53: /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java: Aucun fichier ou dossier de ce type