Querydsl mongodb的查询类（Q-未生成的类）

未能实例化[org.springframework.data.mongodb.repository.support.QuerydslMongoPredicateExecutor]和，因此未生成Q类。有人能帮我解决这个问题吗

我添加了所需的依赖项和插件，如下所述：

<dependency>
    <groupId>com.querydsl</groupId>
    <artifactId>querydsl-core</artifactId>
    <version>4.0.1</version>
</dependency>
<dependency>
    <groupId>com.mysema.querydsl</groupId>
    <artifactId>querydsl-mongodb</artifactId>
    <version>3.6.6</version>
</dependency>
<dependency>
    <groupId>com.mysema.querydsl</groupId>
    <artifactId>querydsl-apt</artifactId>
    <version>3.6.6</version>
</dependency>   



<plugin>
                    <groupId>com.mysema.maven</groupId>
                    <artifactId>apt-maven-plugin</artifactId>
                    <executions>
                        <execution>
                            <goals>
                                <goal>process</goal>
                            </goals>
                            <configuration>
                                <outputDirectory>target/generated-sources/java</outputDirectory>
                                <processor>
                                    org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor
                                </processor>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>

Caused by: java.lang.ClassNotFoundException: com.example.demo.QUser
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_151]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_151]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_151]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:274) ~[spring-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.data.querydsl.SimpleEntityPathResolver.createPath(SimpleEntityPathResolver.java:55) ~[spring-data-commons-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    ... 49 common frames omitted

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如何以及从何处开始应用程序。因为默认情况下IDEA和Eclipse使用了另一个已编译的源文件夹。？@borino我正在使用Eclipse，并且在querydsl apt插件中提到了用于创建查询类的文件夹