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The default version can be changed from the alwaysdata administration, under Environment > Java. This is the version that is especially used when you start java
.
Versions are not necessarily already installed.
To use a Java version that is different from the default one:
JAVA_VERSION=[VERSION] java
(replacing [VERSION]
with the desired Java version).Your Java environment starts off empty, with no ready installed libraries.
To deploy an HTTP application with Java, create a User program type site in the Web > Sites section.
You need to specify the command that will start your Java application, for example:
$ java -Xmx512m -jar jenkins.war --httpListenAddress=0.0.0.0 --httpPort=$PORT
Your application must absolutely listen to IP 0.0.0.0
and the port shown in the site configuration in the Command field or use the IP and PORT environment variables.