Querydsl maven compilation error: QClass.class does not exist

[Frey Zheng]

Hi,

I am new to Querydsl and trying to use it in a simple test project. I followed the official tutorial to configure my 

pom.xml, then mvn clean install was able to generated the Q Classes under target/generated-sources/java. But I got the 

error below:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project 

spring-jqgrid-tutorial: Compilation failure

[ERROR] /D:/Project/spring-jqgrid-tutorial/src/main/java/org/krams/controller/UserController.java:[92,62] package 

QUser.user does not exist

I think the root cause is the generated Q class source files were not compiled automatically into binary class files. I 

did verify there are no QUser.class under my project directory. I also tried to use build-helper-maven-plugin to add 

target/generated-sources/java as a source folder and specify target/generated-sources/java as an additional source root in 

apt-maven-plugin configuration. But I got no luck.

Here is my pom.xml

<properties>

    <querydsl.version>3.3.2</querydsl.version>

    <maven.compiler.plugin.version>3.1</maven.compiler.plugin.version>

    <maven.apt.plugin.version>1.1.1</maven.apt.plugin.version

    <maven.build.helper.plugin.version>1.8</maven.build.helper.plugin.version>

<properties>

<dependencies>

    <dependency>

        <groupId>com.mysema.querydsl</groupId>

        <artifactId>querydsl-jpa</artifactId>

        <version>${querydsl.version}</version>

        </dependency>

    <dependency>

        <groupId>com.mysema.querydsl</groupId>

        <artifactId>querydsl-apt</artifactId>

        <version>${querydsl.version}</version>

        <scope>provided</scope>

    </dependency>

 <dependencies>

<plugins>

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-compiler-plugin</artifactId>

            <version>${maven.compiler.plugin.version}</version>

            <configuration>

                <source>1.7</source>

                <target>1.7</target>

            </configuration>

        </plugin>

        <plugin>

            <groupId>org.codehaus.mojo</groupId>

            <artifactId>build-helper-maven-plugin</artifactId>

                <version>${maven.build.helper.plugin.version}</version>

            <executions>

                <execution>

                    <id>add-source</id>

                    <phase>process-classes</phase>

                    <goals>

                        <goal>add-source</goal>

                    </goals>

                    <configuration>

                        <sources>

                            <source>target/generated-sources/java</source>

                        </sources>

                    </configuration>

                </execution>

            </executions>

        </plugin>

        <plugin>

            <groupId>com.mysema.maven</groupId>

            <artifactId>apt-maven-plugin</artifactId>

            <version>${maven.apt.plugin.version}</version>

            <executions>

                <execution>

                    <goals>

                        <goal>process</goal>

                    </goals>

                    <configuration>

                        <outputDirectory>target/generated-sources/java</outputDirectory>

                        <processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>

                        <additionalSourceRoots>

                            <additionalSourceRoot>target/generated-sources/java</additionalSourceRoot>

                        </additionalSourceRoots>

                    </configuration>

                </execution>

            </executions>

        </plugin>

<plugins>

And here is the generated QUser.java

package org.krams.domain;

import static com.mysema.query.types.PathMetadataFactory.*;

import com.mysema.query.types.path.*;

import com.mysema.query.types.PathMetadata;

import javax.annotation.Generated;

import com.mysema.query.types.Path;

import com.mysema.query.types.path.PathInits;

/**

 * QUser is a Querydsl query type for User

 */

@Generated("com.mysema.query.codegen.EntitySerializer")

public class QUser extends EntityPathBase<User> {

    private static final long serialVersionUID = -1712499619L;

    private static final PathInits INITS = PathInits.DIRECT2;

    public static final QUser user = new QUser("user");

    public final NumberPath<Integer> age = createNumber("age", Integer.class);

    public final StringPath firstName = createString("firstName");

    public final NumberPath<Long> id = createNumber("id", Long.class);

    public final StringPath lastName = createString("lastName");

    public final StringPath password = createString("password");

    public final QRole role;

    public final StringPath username = createString("username");

    public QUser(String variable) {

        this(User.class, forVariable(variable), INITS);

    }

    public QUser(Path<? extends User> path) {

        this(path.getType(), path.getMetadata(), path.getMetadata().isRoot() ? INITS : PathInits.DEFAULT);

    }

    public QUser(PathMetadata<?> metadata) {

        this(metadata, metadata.isRoot() ? INITS : PathInits.DEFAULT);

    }

    public QUser(PathMetadata<?> metadata, PathInits inits) {

        this(User.class, metadata, inits);

    }

    public QUser(Class<? extends User> type, PathMetadata<?> metadata, PathInits inits) {

        super(type, metadata, inits);

        this.role = inits.isInitialized("role") ? new QRole(forProperty("role"), inits.get("role")) : null;

    }

}

Appreciate your help and comments. I can provide more information if required.

[timowest]

Hi.

The additionalSourceRoots part seems unnecessary in the apt-maven-plugin config.

Also does it work better without the build-helper-maven-plugin config?

Br,

Timo

[Frey Zheng]

Hi Timo,

Thanks for the reply.

I got the same error after I removed the additionalSourceRoots and the build-helper-maven-plugin config.

But if I remove the below part from UserController.java, which is the only reference to QUser, I can get the compiled file: QUser.class

Page<User> users = null;

if (qUsername != null) 

users = repository.findAll(QUser.user.username.like(qUsername), pageRequest);

Any idea?

Regards,

Frey

[Timo Westkämper]

Hi.

Do you get a compilation failure or just a warning?

Timo

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[Frey Zheng]

Hi,

It was a failure.

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 6.009 s

[INFO] Finished at: 2014-04-13T16:58:46+08:00

[INFO] Final Memory: 21M/230M

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.

1:compile (default-compile) on project spring-jqgrid-tutorial: Compilation failu

re

[ERROR] /D:/Project/spring-jqgrid-tutorial/src/main/java/org/krams/controller/Us

erController.java:[92,62] package QUser.user does not exist

[ERROR] -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit

ch.

[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 rea

d the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureExc

eption

On Sunday, April 13, 2014 7:30:16 PM UTC+8, Timo Westkämper wrote:

Hi.

Do you get a compilation failure or just a warning?

Timo

[Timo Westkämper]

If the code generation works, maybe the source is broken? Do you import the QUser class correctly?

[Frey Zheng]

The imports should be correct. See below. 

package org.krams.controller;

import java.util.List;

import org.krams.domain.Role;

import org.krams.domain.User;

import org.krams.domain.QUser;

import org.krams.repository.UserRepository;

import org.krams.response.JqgridResponse;

import org.krams.response.StatusResponse;

import org.krams.response.UserDto;

import org.krams.service.UserService;

import org.krams.util.JqgridFilter;

import org.krams.util.JqgridObjectMapper;

import org.krams.util.UserMapper;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.domain.Page;

import org.springframework.data.domain.PageRequest;

import org.springframework.data.domain.Pageable;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

Now I am thinking if it is the query causing the problem: 

users = repository.findAll(QUser.user.username.like(qUsername), pageRequest);

I am using spring data jpa. repository here is an instance of UserRepository, which extends QueryDslPredicateExecutor.

On Sunday, April 13, 2014 7:44:50 PM UTC+8, Timo Westkämper wrote:

If the code generation works, maybe the source is broken? Do you import the QUser class correctly?

[Timo Westkämper]

I am out of ideas. Could you maybe provide a minimal example project on github to verify your issue?

Code generation works, but the generated sources are not compiled under target/classes?

[Frey Zheng]

Trying to build the project from scratch again. If it fails again, I will upload my project on github.

Thanks.

On Sunday, April 13, 2014 8:01:49 PM UTC+8, Timo Westkämper wrote:

I am out of ideas. Could you maybe provide a minimal example project on github to verify your issue?

Code generation works, but the generated sources are not compiled under target/classes?

[Frey Zheng]

Update:

I built everything from scratch again and finally Querydsl is working.

I think this problem was probably caused by incompatible versions of spring data jpa and querydsl.

Now I am using spring data jpa 1.3.2.RELEASE and querydsl 2.8.0., everything works perfectly.

P.S. I removed the additionalSourceRoots and the build-helper-maven-plugin config. They are unnecessary.

[Timo Westkämper]

Good. You might want to consider upgrading Querydsl. 2.8.0 is quite old.

[Frey Zheng]

Update spring-core, spring-data-jpa, querydsl to newest versions. All works fine!

spring-core: 4.0.3.RELEASE

spring-data-jpa: 1.5.1.RELEASE

querydsl: 3.3.2

On Monday, April 14, 2014 11:22:33 PM UTC+8, Timo Westkämper wrote:

Good. You might want to consider upgrading Querydsl. 2.8.0 is quite old.