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When a JDK version reaches EOL security patches may no longer be available. The JDK that your app uses will be included in the slug, which will affect your slug size.

VER VERSAO DO JAVA UPDATE

Depending on the major version you select the latest available update of that JDK will be used each time you deploy your app. OpenJDK versions 17, 15, 13, 11, and 7 are also available. Heroku currently uses OpenJDK 8 to run your application by default. See the troubleshooting article for more information about tuning a JVM process. The following flags are recommended for monitoring resource usage: -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+UseConcMarkSweepGC

private-s: -Xmењ†71m -XX:CICompilerCount=2ДЄdditional JVM flags can be used to monitor resource usage in a dyno.

standard-2x: -Xmењ†71m -XX:CICompilerCount=2.

free, hobby or standard-1x: -Xmx300m -Xss512k -XX:CICompilerCount=2.

When a new dyno type is selected, the following settings are automatically added to JAVA_TOOL_OPTIONS:

-XX:+UseContainerSupport (for Java 11 and higher).

When a Java process is started on your dyno, the following Java options will be added to JAVA_TOOL_OPTIONS and automatically picked up by Java: Individual options not overridden in the Procfile command or custom JAVA_TOOL_OPTIONS will still be in effect. Setting your own will cause its value to be appended to HerokuвЂ™s defaults and take precedence. You can also set your own JAVA_TOOL_OPTIONS config var. For example, to change the default of -Xmx300m, you could pass in: web: java -Xms150M -jar target/myapp.jar You can override these settings in the Procfile command (which takes precedence over the defaults). Since Java automatically picks it up, you do not need to include it in your Procfile command. Heroku uses this to set default Java options based on dyno size. JAVA_TOOL_OPTIONS is directly supported by Java and intended to augment a command line in environments where the command-line cannot be accessed or modified.

JAVA_OPTS: Default Java options based on dyno size (identical to JAVA_TOOL_OPTIONS).

JAVA_TOOL_OPTIONS: Default Java options based on dyno size.

See Connecting to Relational Databases on Heroku with Java for more information.

JDBC_DATABASE_URL: If a DATABASE_URL variable is present, this will be populated with the converted form.

LD_LIBRARY_PATH: With the location of the JDK shared libraries.

VER VERSAO DO JAVA INSTALL

JAVA_HOME: The location of the JDK install directory.

PORT: HTTP port to which the web process should bind.

The following environment variables will be set in dyno at boot-time:

The maven repo is cached between builds to improve performance. You can override this behavior by explicitly setting a Maven version. However, if Heroku detects a mvnw script in your applicationвЂ™s repository, it will run this instead of the default Maven installation.

The following command is run to build your app: $ mvn -B -DskipTests clean dependency:list install When a deployed application is recognized as a Java application, Heroku responds with Java app detected. Heroku Java support for Maven will be applied to applications that contain a pom.xml. The default build system for Java application on Heroku is Maven. You can read about Play framework support in the Play framework support reference. General Java support on Heroku refers to the support for all frameworks except for Play. This document describes the general behavior of Heroku as it relates to the recognition and execution of Java applications. Heroku is capable of running Java applications across a variety of Java implementations and includes support for framework-specific workflows.

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