Error:(23, 26) java: lambda expressions are not supported in -source 1.5 (use -source 8 or higher to enable lambda expressions)

Question

I have added the source target below into pom.xml.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>priv.winnie</groupId>
  <artifactId>newfeature</artifactId>
  <version>1.0-SNAPSHOT</version>

<dependencies>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.10</version>
  </dependency>
</dependencies>

  <build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.1</version>
      <configuration>
        <source>1.8</source>
        <target>1.8</target>
      </configuration>
    </plugin>
  </plugins>
  </build>
</project>

I have also changed the Java compiler to 1.8 within IntelliJ. I'm running OpenJDK 1.8.0.

Why it still using Java source level 1.5 to compile code?

Please show you full pom file and the full log output...Furthermore check on console first to exclude influences of your IDE... — khmarbaise, Jul 22 '17 at 11:48
@khmarbaise Pasted my pom.xml in my answer. And it shows red wavy line on "import java.util.function.Consumer;" in the class file. — xksyvone, Jul 22 '17 at 15:12
Are you getting the error from a Maven goal (like `mvn clean compile`) or from within IntelliJ? — Makoto, Jul 22 '17 at 15:21
I see this red wavy line in Intellij with maven plugin. It is abnormal, so i hit this compile issue when execute 'run' in Intellij IDE. — xksyvone, Jul 22 '17 at 15:31
As mentioned please check your complete build on plain command line first to exclude influences of the IDE first... — khmarbaise, Jul 22 '17 at 15:50

score 3 · Answer 1 · answered Jul 22 '17 at 17:30

3

go to project property > java compiler and check there, jdk version.

answered Jul 22 '17 at 17:30

Anshul Sharma

3,432
1
12
17

score 1 · Accepted Answer · answered Jul 23 '17 at 00:37

1

Fixed this issue. I found it was unnecessary to add java1.8 into pom.xml. I just need to change the Modules->language level into 8 - Lambdas,type annotations etc.

answered Jul 23 '17 at 00:37

xksyvone

105
1
12

Error:(23, 26) java: lambda expressions are not supported in -source 1.5 (use -source 8 or higher to enable lambda expressions)

2 Answers2