运行maven exec插件时，java的坏版本

Question

我当前版本的java是7：

java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) Server VM (build 24.80-b11, mixed mode)

我有命令mvn8，其中将java_home设置为8：

mvn8 -version
Java HotSpot(TM) Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0
Apache Maven 3.0.3 (r1075438; 2011-02-28 18:31:09+0100)
Maven home: /home/.../apache-maven-3.0.3
Java version: 1.8.0_66, vendor: Oracle Corporation
Java home: /home/.../jdk1.8.0_66/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-45-generic", arch: "i386", family: "unix"

现在问题来了。当我在项目中运行我的一个配置文件(有生成文件的maven exec插件)时：

mvn8 exec:exec -P mo2ja -o

我有个例外：

Java HotSpot(TM) Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0
[INFO] Scanning for projects...
...
 ERROR:java.time.LocalDateTime cannot be resolved to a type. 
ERROR:java.time.LocalDate cannot be resolved to a type. 
[ERROR] Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 2 (Exit value: 2)
    at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
    at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
    at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:764)
    at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:711)
    at org.codehaus.mojo.exec.ExecMojo.execute(ExecMojo.java:289)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

所以它似乎仍然需要我的系统java。为什么mvn版本打印java8？当我更改我的系统java时，它就正常工作了。这是maven的一些特性，还是我使用的插件问题？

更新：

当我调试maven exec插件时，我看到了这一行：

[DEBUG] Executing command line: java -classpath ... org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader -control definitions.model -models entity.model,dao.model -source src/main/resources -target src-gen

因此，问题是如何使用与我正在执行的mvn相同的java版本。

这是我的个人资料：

    <profile>
        <id>mo2ja</id>
        <dependencies>
            <dependency>
                <groupId>org.sqlproc.model</groupId>
                <artifactId>sqlmodel</artifactId>
                <scope>runtime</scope>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>exec-maven-plugin</artifactId>
                    <configuration>
                        <executable>java</executable>
                        <classpathScope>runtime</classpathScope>
                        <arguments>
                            <argument>-classpath</argument>
                            <classpath>
                                <dependency>org.sqlproc.model:sqlmodel</dependency>
                                <dependency>mysql:mysql-connector-java</dependency>
                                <dependency>org.sqlproc:sql-processor</dependency>
                                <dependency>org.slf4j:slf4j-api</dependency>
                            </classpath>
                            <argument>org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader</argument>
                            <argument>-control</argument>
                            <argument>definitions.model</argument>
                            <argument>-models</argument>
                            <argument>entity.model,dao.model</argument>
                            <argument>-source</argument>
                            <argument>src/main/resources</argument>
                            <argument>-target</argument>
                            <argument>src-gen</argument>
                        </arguments>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </profile>

Answer 1

更改您的maven编译器插件以允许级别1.8

<plugins>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.5.1</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
    </configuration>
  </plugin>
</plugins>