Error: Lambda expressions are allowed only at source level 1.8 or above

2018-05-26

这个问题也是奇葩，前几天还好好的，突然打开 idea 运行项目就报这个错误，真是无语了，网上搜了一波，终于解决了

检查 pom 文件的 target 和 source

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

或

1
2
3
4
5
6
7
8
9
10
11
12
13
14 <build>
       <plugins>
           <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-compiler-plugin</artifactId>
               <version>3.7.0</version>
               <configuration>
                   <source>1.8</source>
                   <target>1.8</target>
                   <encoding>UTF-8</encoding>
               </configuration>
           </plugin>
       </plugins>
   </build>

检查项目的编译环境

打开 idea 设置

检查项目下的 .settings/org.eclipse.jdt.core.prefs 文件

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.source=1.8

clean 一下 maven 项目，重新运行，终于搞定了

jsonContent: meta: false pages: false posts: title: true date: true path: true text: false raw: false content: false slug: false updated: false comments: false link: false permalink: false excerpt: false categories: false tags: true