Error type 3 Error: Activity class {com.example.dreamworld/com.example.dreamworld.MainActivity} does not exist. Error while Launching activity

Example 1: [ERROR] Error executing Maven. java.io.FileNotFoundException: The specified user settings file does not exist: /usr/lib/jvm/java-1.8.0-openjdk-amd64

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.7.0</version>
</plugin>

Example 2: Error executing Maven. java.io.FileNotFoundException: The specified user settings file does not exist: /etc/java-8-openjdk

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-3.b16.el6_9.x86_64

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Python Example

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