我有同样的问题，如this，我已经尝试了两种解决方案，但没有一个适合我。
我从它的github页面复制了querydsl的配置。
所以我的querydsl maven依赖关系：

<dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>4.1.4</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.6.1</version>
    </dependency>

还有我的apt配置：

<plugin>
            <groupId>com.mysema.maven</groupId>
            <artifactId>apt-maven-plugin</artifactId>
            <version>1.1.3</version>
            <executions>
                <execution>
                    <goals>
                        <goal>process</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>target/generated-sources/java</outputDirectory>
                        <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>com.querydsl</groupId>
                    <artifactId>querydsl-apt</artifactId>
                    <version>4.1.4</version>
                </dependency>
            </dependencies>
      </plugin>

我还修改了eclipse.ini，在第一行添加了以下内容：

-vm
D:\Program Files\Java\jdk1.8.0_91\bin\javaw.exe

但我在eclipse中也得到同样的错误：

You need to run build with JDK or have tools.jar on the classpath.If this occures during eclipse build make sure you run eclipse under JDK as well (com.mysema.maven:apt-maven-plugin:1.1.3:process:default:generate-sources)

当我在cmd中运行mvn genarate-sources时，出现了同样的错误：

[INFO] --- apt-maven-plugin:1.1.3:process (default) 
[ERROR] execute error
org.apache.maven.plugin.MojoExecutionException: You need to run build with JDK or have tools.jar on the classpath.If this occures during eclipse build make sure you run eclipse under JDK as well

有人能帮我吗？