The compiler compliance specified is 1.6 but a JRE 1.8 is used

Possible solution:

1. Right-click on your project and select "Android Tools -> Fix Project Properties". (if this doesn’t work, try the following option)
2. Right-click on your project and select "Properties -> Java Compiler", check “Enable project specific settings” and select
   1.5 or 1.6 from the “Compiler compliance settings” select box.
3. Under Window -> Preferences -> Java -> Compiler, set Compiler
   compliance level to 1.5 or 1.6.

Go to windows>preference>java>compiler.
Tick the check box “use default compliance setting” then apply and close.
Right-click on the project and go to build path> configure build the path
Under Libraries tab remove JRE System Library and click on add library
select the radio box execution environment and select the environment
Apply nad Close

Following changes need to be done under folder name of your project: –

.settings

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.methodParameters=generate
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
org.eclipse.jdt.core.compiler.processAnnotations=disabled
org.eclipse.jdt.core.compiler.release=disabled
org.eclipse.jdt.core.compiler.source=1.8

IDE configuration

I’m working on VSCode and I just made next thing
I changed version in pom.xml to one I installed on computer

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.11</maven.compiler.source>
        <maven.compiler.target>1.11</maven.compiler.target>
    <java.version>1.11</java.version>
    </properties>

Before I had 1.8 and now there is 1.11