Failed to compile java source files

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[Solved] Java Error Invalid Source Release 18 IntelliJ and Eclipse

In this short article, we will showcase how to solve java: error: invalid source release: 18.

First, we will take a close look at the main causes behind the error. Then, we will explore different ways of fixing it.

IntelliJ IDEA — Java: Error: Invalid Source Release: 18

In short, The Invalid source release error occurs when there is a JDK version mismatch between the project (specified in Maven) and the IntelliJ structure.

In this case, “source release 18” refers to Java 18.

To reproduce the error, let’s choose Java 8 (1.8) as the main JDK of our project in IntelliJ:

Next, we are going to edit the pom.xml file to specify Java 18 as the value of maven.compiler.source:

Now, if we compile the project using Maven, we will get Invalid source release: 18:

In a nutshell, the root cause of the error is trying to compile a project using a version of Java that is not supported by the JDK configured in IntelliJ.

So to fix the error, we need to upgrade the project version to JDK 18.

To do so, we can select our project, then navigate to:

 File -> Project Structure -> Project Settings -> Project -> Project Language Level

Sometimes, we need to make sure to align the version for the Java Compiler as well:

 IntelliJ IDEA -> Preferences -> Build, Execution and Deployment -> Compiler -> Java Compiler -> Project bytecode version

Another solution would be removing the maven.compiler.source property and set maven.compiler.target to the same version (1.8 in our case).

Fixing Invalid Source Release Error in Eclipse

Now, let’s see how to reproduce and solve the error in Eclipse IDE.

First, we will set the maven compiler source to Java 18:

 maven.compiler.source>18/maven.compiler.source>

Next, we are going to select jdk1.8 as the default JRE in Eclipse:

Now, let’s run the mvn clean install command and view the logs:

 [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins. . Fatal error compiling: invalid source release: 18 -> [Help 1]

As we can see, the build fails with the excat same error.

So, to fix the issue, we need to make sure that the JRE version of the project is greater than or equal to the one specified in maven.compiler.source.

Conclusion

In this short article, we covered in-depth the java: error: invalid source release: 18.

We see how to reproduce and fix the error both in IntelliJ and Eclipse.

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[Fixed] Fatal Error Compiling: Invalid Target Release: 11

In this short tutorial, we will explore different ways of solving fatal error compiling: invalid target release: 11.

First, we will explain the root cause behind the error. Then, we will demonstrate how to fix it in practice.

Understanding the Error

Typically, the error occurs when we compile a project with a Java/JDK version that is not compatible with the target version.

For example, trying to compile a project that uses Java 8 whereas Maven uses Java 11 will result in fatal error compiling: invalid target release: 11.

Fixing Fatal Error Compiling: Invalid Target Release: 11

Before diving deep into the details, let’s see how to reproduce the error.

First, we will assume that our project is configured with JDK 1.8.

Next, let’s specify another version in Maven. For instance, Java 11:

 properties> java.version>11/java.version> /properties>

Now, let’s compile the project using the Maven command mvn compile:

 C:\Users\Asus\GIT\employeeapi>mvn compile [INFO] Scanning for projects. . [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE . [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project employeeapi: Fatal error compiling: invalid target release: 11 -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:

As we can see in the logs, the compilation fails because the target version Java 11 doesn’t match the project version.

Using Maven

To fix the error, we must set a Java version that is less than or equal to the version of the project.

So, let’s update Maven to use Java 8 instead. To do so, we need to edit the pom.xml file:

 properties> java.version>1.8/java.version> /properties>

Alternatively, we can use maven.compiler.target to achieve the same objective:

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

That way, we tell the compiler to use 1.8 which denotes Java 8.

Please note that using maven.compiler.source is also recommended to avoid the error: java: error: invalid source release.

Now, let’s run mvn compile and see what will happen:

 C:\Users\Asus\GIT\employeeapi>mvn compile [INFO] Scanning for projects. . [INFO] --- maven-compiler-plugin:3.10.1:compile (default-compile) @ employeeapi --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 14 source files to C:\Users\Asus\GIT\employeeapi\target\classes [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS

As shown above, our project is now compiled with success.

Using IDE

Another solution would be configuring the project with a JDK version compatible with the one specified in Maven.

So, in our case, all we need to do is change the project settings to use Java 11 instead of Java 8:

Using JAVA_HOME Environment Variable

In some cases, the problem could be in the JAVA_HOME. It may denote an older or unused version.

So, to solve the issue, we need to make sure that we installed the proper JDK version:

 C:\Users\Asus>java --version java 18.0.1.1 2022-04-22 Java(TM) SE Runtime Environment (build 18.0.1.1+2-6) Java HotSpot(TM) 64-Bit Server VM (build 18.0.1.1+2-6, mixed mode, sharing)

Then, we need to update the JAVA_HOME environment variable to point to the correct JDK installation:

 C:\Users\Asus>echo %JAVA_HOME% C:\Program Files\Java\jdk-18.0.1.1

Conclusion

To sum it up, we explained in detail how to solve the error: fatal error compiling: invalid target release: 11.

Along the way, we highlighted the main cause of the error. Then, we illustrated how to solve it using practical examples.

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If you enjoy reading my articles, buy me a coffee ☕. I would be very grateful if you could consider my request ✌️

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Failed to compile java source files

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