[Solved] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure

Hello Guys, How are you all? Hope You all Are Fine. Today I am trying to run mvn clean install but I am facing following error Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure in Java. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How This Error Occurs ?

I am trying to run mvn clean install but I am facing following error.

[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!

diamond operator is not supported in -source 1.5 (use -source 7 or higher to enable diamond operator)

diamond operator is not supported in -source 1.5 [ERROR] (use -source 7 or higher to enable diamond operator)

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure:

How To Solve Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure Error ?

Solution 1: add the following properties

Here problem is Maven doesn’t have a source that will allow to compile the diamond operators So that we need to configure maven-compiler-plugin itself So Just add the following properties.

<properties>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
</properties>

Now, Your problem might be solved.

Solution 2: add this code in effective POM

Just need to add this code in effective POM.xml file.

<dependencies>
...
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Solution 3: Using org.projectlombok:lombok

If You are using org.projectlombok:lombok then You need to update org.projectlombok:lombok version to 1.16.22 or 1.18.12, Just like this.

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>

And my error solved.

Summary

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

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