Vscode-java: [Java] Lambda expressions are allowed only at source level 1.8 or above

[clankill3r]

I try to use lambda's but I get the following error:

[Java] Lambda expressions are allowed only at source level 1.8 or above

In my user settings I have set:

"java.home": "/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home"

How can I set the source level?

Environment

• Operating System: OSX
• JDK version: jdk1.8.0_144
• Visual Studio Code version: 1.17.1
• Java extension version: 0.1.0

[fbricon]

Do you use Maven to build your app, or something else?

When using Maven, you need to set the maven-compiler-plugin source and target elements to 1.8

[Carrein]

These 'errors' are quite common in Java projects in VS.

[Java] Syntax error, annotations are only available if source level is 1.5 or greater
[Java] Method references are allowed only at source level 1.8 or above
[Java] Lambda expressions are allowed only at source level 1.8 or above

They don't affect the files, as they compile fine. I was informed such errors occur when the project hierarchy is not properly setup. Is there a way to silence them? I am writing simple class files using an open folder as a mock 'directory' with javac, java to run them.

[ylilarry]

Same problem here. I'm using Gradle. Is there any way I can set it up or suppress the error?
Ok. I set gradle to use 1.8 and it works for me now.

[UtkarshGupta-CS]

Change the extension generated file .settings/org.eclipse.jdt.core.prefs

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.source=1.8

[mrpanc]

@UtkarshGupta-CS Thank you so much. It has solved my problem.

[yaohaizh]

Close this issue as it had been solved. Project setting issue.

[PhillipMwaniki]

Do you use Maven to build your app, or something else?

When using Maven, you need to set the maven-compiler-plugin source and target elements to 1.8

You're the best.

[AnhNguyen92]

add maven-compiler-plugin source and target elements to 1.8 to pom file sovle this problem

[Stejnar]

@ylilarry Can you please elaborate on how you accomplished this?