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jenkins构建java项目时出现的报错情况：

1. $ mvn clean install
2. FATAL: command execution failed
3. java.io.IOException: error=2, No such file or directory
4.         at java.lang.UNIXProcess.forkAndExec(Native Method)
5.         at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
6.         at java.lang.ProcessImpl.start(ProcessImpl.java:134)
7.         at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
8. Caused: java.io.IOException: Cannot run program "mvn" (in directory "/var/lib/jenkins/workspace/es"): error=2, No such file or directory
12. 报错情况2：

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1. /var/lib/jenkins/tools/hudson.tasks.Maven_MavenInstallation/maven_3.5.3/bin/mvn clean install
2. which: no java in (/var/lib/jenkins/tools/hudson.tasks.Maven_MavenInstallation/maven_3.5.3/bin:/sbin:/usr/sbin:/bin:/usr/bin)
3. The JAVA_HOME environment variable is not defined correctly
4. This environment variable is needed to run this program
5. NB: JAVA_HOME should point to a JDK not a JRE
6. Build step "Invoke top-level Maven targets" marked build as failure
7. Finished: FAILURE
10. 报错情况3：

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1. [INFO] Changes detected - recompiling the module!
2. [INFO] Compiling 33 source files to /var/lib/jenkins/workspace/es/target/classes
3. [INFO] -------------------------------------------------------------
4. [ERROR] COMPILATION ERROR :
5. [INFO] -------------------------------------------------------------
6. [ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? [INFO] 1 error [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 02:42 min [INFO] Finished at: 2018-05-29T18:32:22+08:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project ruhnn-visual-search-background: Compilation failure [ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? [ERROR] [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] [url=http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException]http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException[/url]
9. 解决方法:

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1. 安装maven  并配置到jenkins配置里
2. 下载地址  https://maven.apache.org/download.cgi
3. wget  http://mirror.bit.edu.cn/apache/maven/maven-3/3.5.2/binaries/apache-maven-3.5.2-bin.tar.gz
4. tar zxvf apache-maven-3.5.2-bin.tar.gz
5. mv apache-maven-3.5.2 /usr/local/
6. /usr/loca/apache-maven-3.5.2/bin/mvn --version
7. jenkins -> 系统管理 -> 全局工具配置
8. Maven Configuration -> Settings file in filesystem -> File Path /usr/local/apache-maven-3.5.2/conf/settings.xml
9. Global settings file on filesystem -> File Path 同上
10. 下拉到Maven，Maven安装，Name（自定义，如maven3.5.2），MAVEN_HOME填 “/usr/local/apache-maven-3.5.2”
11. 左下角“save”

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安装maven 也可以参考：http://www.cnblogs.com/weifeng1463/p/8920765.HTML

   
   
  

1. 安装jdk
3. jenkins -> 系统管理 -> 全局工具配置
5. JDK安装
6. JDK  别名  JDK1.8
7. 自动安装
8.           从java.sun.com 安装
9.           版本  Java SE Development Kit 8u162

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1. [/code]
3. [code]
5. 最后测试可以成功构建：

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1. [/code]
2. [code]

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