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java — Java application launcher. More information: <https://docs.oracle.com/en/java/javase/25/docs/specs/m

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the java command: Java application launcher. More information: <https://docs.oracle.com/en/java/javase/25/docs/specs/man/java.html>.

Solution

java — Java application launcher. More information: <https://docs.oracle.com/en/java/javase/25/docs/specs/man/java.html>.

Execute a Java .class file that contains a main method by using just the class name:

java {{classname}}

Execute a Java program and use additional third-party or user-defined classes:

java -classpath {{path/to/classes1}}:{{path/to/classes2}}:. {{classname}}

Execute a .jar program:

java -jar {{filename.jar}}

Execute a .jar program with debug waiting to connect on port 5005:

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005 -jar {{filename.jar}}

Display JDK, JRE, and HotSpot versions:

java -version

Display help:

java -help

Code Snippets

Execute a Java `.class` file that contains a main method by using just the class name

java {{classname}}

Execute a Java program and use additional third-party or user-defined classes

java -classpath {{path/to/classes1}}:{{path/to/classes2}}:. {{classname}}

Execute a `.jar` program

java -jar {{filename.jar}}

Execute a `.jar` program with debug waiting to connect on port 5005

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005 -jar {{filename.jar}}

Display JDK, JRE, and HotSpot versions

java -version

Context

tldr-pages: common/java

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