【发布时间】：2018-02-24 10:19:16
【问题描述】：
我正在尝试构建一个使用 lambda 表达式的 Kafka Streams 应用程序。
我的 maven 构建配置是 mvn clean install
当我执行 RunAs > Maven 构建时，我收到以下错误：
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /home/junaid/eMumba/StreamsExample/streams.examples/src/main/java/myapps/Pipe.java:[53,38] lambda expressions are not supported in -source 1.5
(use -source 8 or higher to enable lambda expressions)
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.265 s
[INFO] Finished at: 2018-02-24T14:50:04+05:00
[INFO] Final Memory: 11M/150M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project streams.examples: Compilation failure
[ERROR] /home/junaid/eMumba/StreamsExample/streams.examples/src/main/java/myapps/Pipe.java:[53,38] lambda expressions are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable lambda expressions)
在Java Build Path 我有JRE System Library [JavaSE 1.8]。
在Preferences > Java > Installed JREs 我有java-8-openjdk
这是我的 pom.xml：
我在最后添加了 org.apache.maven.plugins: maven-compiler-plugin 依赖项。
<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>streamsexamples</groupId>
<artifactId>streams.examples</artifactId>
<version>0.1</version>
<packaging>jar</packaging>
<name>Kafka Streams Quickstart :: Java</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<kafka.version>1.0.0</kafka.version>
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<!-- Execute "mvn clean package -Pbuild-jar" to build a jar file out of
this project! -->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>
${project.build.directory}/libs
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>
myapps.Pipe
</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- Apache Kafka dependencies -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
<version>${kafka.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.json/json -->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180130</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
</dependency>
</dependencies>
</project>
我能做些什么来解决这个问题？
【问题讨论】：
-
看起来，无论出于何种原因，您的构建都在使用 JDK 5。您能告诉我们您的
JAVA_HOME设置为什么吗？