How to Execute External JAR Files From Your Java GUI Application?

Executing External Jars in Java GUI Programs

Implementing a GUI interface that allows users to initiate the execution of external jar files presents a common challenge in Java programming. This article aims to provide a comprehensive solution to this problem.

Solution:

To execute external jars within a Java GUI program, the user can leverage the Runtime.getRuntime().exec() method. This method offers a convenient way to launch a separate system process from within the Java application.

The following code snippet demonstrates how to execute a jar file:

<code class="java">Process proc = Runtime.getRuntime().exec("java -jar A.jar");</code>

The proc variable now encapsulates the execution of the external jar file. To obtain real-time information about the running process, it is advised to access the input and error streams:

<code class="java">InputStream in = proc.getInputStream();
InputStream err = proc.getErrorStream();

BufferedReader reader = new BufferedReader(new InputStreamReader(in));
BufferedReader errorReader = new BufferedReader(new InputStreamReader(err));

String line;
while ((line = reader.readLine()) != null) {
    // Process output
}

while ((line = errorReader.readLine()) != null) {
    // Process error output
}</code>

By capturing the output and error streams, you can monitor the progress and potential issues during the external jar execution.

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