Maven command to run a Java main class

There might be more than one Java classes in a Maven project that contains the main() function. To pick up a specific one to run, you can try the following command:

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mvn exec:java -Dexec.mainClass="my_main_class_name"
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In case the memory is not enough, try the following command:

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export MAVEN_OPTS=-Xmx1024m
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where 1024m is the max heap memory