I'm using the latest maven 3.3.9 which enforces java 8, and trying to compile a project in java 7 using a java 7 maven toolchain.
As per: The maven guide I've put in the maven toolchain plugin to try and tell it to use java 7 to compile the app. My project setup is as follows:
top_module --> (have put in maven toolchain plugin in this pom.xml)
---submodule1
---submodule2
This is my parent 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>
<parent>
<groupId>parent</groupId>
<artifactId>build-base</artifactId>
<version>1.0.17</version>
</parent>
<groupId>top_module</groupId>
<artifactId>top_module</artifactId>
<version>1</version>
<packaging>pom</packaging>
<name>${project.artifactId}</name>
<modules>
<module>submodule1</module>
<module>submodule2</module>
</modules>
<properties>
...
</properties>
<dependencyManagement>
<dependencies>
<dependency>
...
</dependency>
<dependency>
...
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
...
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<!-- Ensure we compile as the correct jdk version -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-toolchains-plugin</artifactId>
<version>1.1</version>
<executions>
<execution>
<goals>
<goal>toolchain</goal>
</goals>
</execution>
</executions>
<configuration>
<toolchains>
<jdk>
<version>1.7</version>
<vendor>sun</vendor>
</jdk>
</toolchains>
</configuration>
</plugin>
<!-- Maven WAR Plugin -->
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>${maven.war.plugin.version}</version>
<inherited>true</inherited>
<configuration>
<archiveClasses>true</archiveClasses>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<versionRange>[1.0.0,)</versionRange>
<goals>
<goal>enforce</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore />
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
...
</project>
The build doesn't run any toolchain related steps and conks out when running mvn clean install due to a plugin being incompatible with java 8, which obviously means the toolchain isn't getting run. Do I need anything else in the pom?
This is my toolchains.xml file in my M2_HOME:
<?xml version="1.0" encoding="UTF8"?>
<toolchains>
<!-- JDK toolchains -->
<toolchain>
<type>jdk</type>
<provides>
<version>1.6</version>
<vendor>sun</vendor>
</provides>
<configuration>
<jdkHome>C:\Java\jdk1.6.0_45</jdkHome>
</configuration>
</toolchain>
<toolchain>
<type>jdk</type>
<provides>
<version>1.7</version>
<vendor>sun</vendor>
</provides>
<configuration>
<jdkHome>C:\Java\jdk1.7.0_79</jdkHome>
</configuration>
</toolchain>
</toolchains>
