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Maven generated static metamodels in Hibernate 5.2 not recognized by DAO classes

I have successfully generated metamodels and all metamodel classes are outputted in target/annotations directory.
But my problem is that my other classes such as DAOImpl doesn't recognize these metamodel generated classes. Any help please?
Here is how I generate metamodels using my maven project's pom.xml file:
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>4.3.4.Final</version>
</dependency>
</dependencies>
</plugin>

Check do you have set this:
<plugin> <!--Compiler instructions to generate model, add to sources.-->
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArguments>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</compilerArguments>
</configuration>
</plugin>
<plugin><!--path were to generate model, add to -->
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<!-- source output directory -->
<outputDirectory>target/metamodel</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.3</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>target/metamodel</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
I think main problem is that folder where you generated classes isn't linked to project sources. You should tell your project that this directory is source folder or generate everything under src directory.

Maven configuration for using Dagger 2 in a mixed Java/Kotlin project

What is the recommended Maven setup for using Dagger 2 in a mixed Java/Kotlin project?
I found a sample project which uses Gradle: https://github.com/damianpetla/kotlin-dagger-example
Something similar with Maven would be very helpful.
UPDATE: What have I tried?
I used the Kotlin configuration from kotlinlang.org/docs/reference/using-maven.html
and the Dagger configuration from google.github.io/dagger.
I also used the build-helper-maven-plugin plugin to integrate the annotation processing in IDEA.
My main problem was that I run into compilation cycles. My configuration mixed the compilation of Kotlin and calling the annotation processor, which generates Dagger2 classes. I unsystematically tried to separate both phases but lacked the deeper Maven understanding to get it working.

javac can scan both source files (java) and classes in search for annotations:
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javac.html#processing
This means that you can make this work if you don't have any Dagger-generated classes referenced in Kotlin code (which means Dagger module implementations)
invoke kotlin compiler (no Dagger generated types in Kotlin code)
invoke annotation processor (processes annotations in both java files and kotlin-compiled files)
invoke java compiler - has access to both Dagger generated types and Kotlin types
You can write your services in both java and kotlin, but the module must be created by a java class
Here is the corresponding 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>
<groupId>com.test</groupId>
<artifactId>testkotlindagger</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<kotlin.version>1.0.6</kotlin.version>
<dagger2.version>2.7</dagger2.version>
</properties>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test</artifactId>
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
<!-- Dagger 2 -->
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger</artifactId>
<version>${dagger2.version}</version>
</dependency>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger-compiler</artifactId>
<version>${dagger2.version}</version>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>kotlin-maven-plugin</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals> <goal>compile</goal> </goals>
<configuration>
<sourceDirs>
<source>src/main/java</source>
<source>src/main/kotlin</source>
</sourceDirs>
</configuration>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals> <goal>test-compile</goal> </goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<version>2.2.4</version>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>compile</phase>
<configuration>
<outputDirectory>target/generated-sources/annotations</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<executions>
<!-- Replacing default-compile as it is treated specially by maven -->
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<!-- Replacing default-testCompile as it is treated specially by maven -->
<execution>
<id>default-testCompile</id>
<phase>none</phase>
</execution>
<execution>
<id>java-compile</id>
<phase>compile</phase>
<goals> <goal>compile</goal> </goals>
</execution>
<execution>
<id>java-test-compile</id>
<phase>test-compile</phase>
<goals> <goal>testCompile</goal> </goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
On the other hand, if you include Dagger-generated types in your kotlin code, you must have these available before kotlin code is compiled, which means you need Kotlin-aware annotation processor (KAPT)
In this scenario the problem boils down to the question:
Is kapt supported in maven?
Sadly, the answer is no, but there is a bug filed to support it:
https://youtrack.jetbrains.com/issue/KT-14478

Since kapt is now supported in maven, you can write your services in both Java and Kotlin, and the module can be created by either a Java class or a Kotlin class. You can configure pom.xml build file like this:
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>1.7.20</version>
</dependency>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger</artifactId>
<version>2.22</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>kapt</id>
<goals>
<goal>kapt</goal>
</goals>
<configuration>
<sourceDirs>
<sourceDir>src/main/kotlin</sourceDir>
<sourceDir>src/main/java</sourceDir>
</sourceDirs>
<annotationProcessorPaths>
<!-- Specify your annotation processors here. -->
<annotationProcessorPath>
<groupId>com.google.dagger</groupId>
<artifactId>dagger-compiler</artifactId>
<version>2.22</version>
</annotationProcessorPath>
</annotationProcessorPaths>
</configuration>
</execution>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<sourceDirs>
<sourceDir>src/main/kotlin</sourceDir>
<sourceDir>src/main/java</sourceDir>
</sourceDirs>
</configuration>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
<configuration>
<sourceDirs>
<sourceDir>src/test/kotlin</sourceDir>
<sourceDir>src/test/java</sourceDir>
</sourceDirs>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
<executions>
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<execution>
<id>default-testCompile</id>
<phase>none</phase>
</execution>
<execution>
<id>java-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>java-test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
These are the links usefull to read when you want to create maven project with java, kotlin and dagger:
https://www.baeldung.com/kotlin/maven-java-project
https://kotlinlang.org/docs/kapt.html#using-in-maven
https://github.com/google/dagger#installation
Please note that kapt is still not supported for IntelliJ IDEA's own build system. Because of this, you will not be able to compile and run the application in the Intellij IDE by clicking on the Play button next to the Main method. To run the application, first build the project using the maven toolbox. After that, you can run the application in the Intellij IDE by clicking on the Play button next to the Main method. Alternatively you can create a run configuration to run the jar file. After that, you can run this configuration, or run it in debug mode by clicking on the run or debug button next to the run configuration combobox.

Can I generate JPA metamodels and QueryDSL models in same project

I have a project where we have code implemented using JPA and we use metamodels. To generate hibernate metamodels we use following as a maven plaugin
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>process-sources</phase>
<configuration>
<outputDirectory>${project.build.directory}/generated-sources/annotations/</outputDirectory>
<processors>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
</plugin>
Now we like to try out QueryDSL, and I added the maven configuration to generate QueryDSL-models. It looks like following.
<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>
</plugin>
But now when I run maven clean test it complains that JPA Hibernate metamodels are missing. But if I switch the order then it complaints that other metamodels are missing. So is there a way to use both of them in same porject?

I guess your problem is not the generation itself, but that you have classes in your codebase that depend on the generated classes.
Have you tried to add the generation output directories as source directories like this?
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.3</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated-sources/annotations</source>
<source>${project.build.directory}/generated-sources/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
Should work for mvn on CLI as well for m2e in Eclipse.

No JAXB Classes Generated from xsd using Maven Plugin

am not able see any of jaxb classes generated from my xsd using jaxb2-maven-plugin
<bulid>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<schemaDirectory>src/main/xsd</schemaDirectory>
<sourceGenerationDirectory>target/sources</sourceGenerationDirectory>
<classGenerationDirectory>target/classes</classGenerationDirectory>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</bulid>
<dependencies>
<dependency>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
</dependency>
and i ran my pom by giving
clean install generate:generate is that a correct way ? please suggest a way to generate jaxb classes
i even tried to run by mvn generate-sources nothing is getting generated

This has worked for me at some point in time; you can work from there:
<plugin>
<groupId>com.sun.tools.xjc.maven2</groupId>
<artifactId>maven-jaxb-plugin</artifactId>
<version>1.1</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<removeOldOutput>false</removeOldOutput>
<schemaDirectory>src/main/resources/xsd</schemaDirectory>
<includeBindings>
<includeBinding>*.xjb</includeBinding>
</includeBindings>
</configuration>
</plugin>
The plugin is bound to the generate-sources phase.
Cheers,

i just changed my goal to xjc and mvn jaxb2:xjc it worked i was able to get the jxb classes generated

Maven: How to handle generated sources for test(only)?

Usually generated sources should be created in the target dir. But how do I handle classes that are only used for test? I dont want that these classes get packaged in my jar. Is there a common way to deal with this situation?

Use maven build helper plugin's add-test-source goal to add your generated test source files to the build -> http://mojo.codehaus.org/build-helper-maven-plugin/add-test-source-mojo.html
It ensures that the directories added by this goal will be picked up automatically by the compiler plugin during test-compile phase of the build.
EDIT
Here is the example of how to generate code for testign with cxf-codegen-plugin
<build>
<plugins>
...
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-codegen-plugin</artifactId>
<version>${cxf.version}</version>
<executions>
<execution>
<id>generate-test-sources</id>
<phase>generate-test-sources</phase>
<configuration>
<sourceRoot>${project.build.directory}/generated/cxf</sourceRoot>
<wsdlOptions>
<wsdlOption>
<wsdl>${basedir}/src/main/wsdl/myService.wsdl</wsdl>
</wsdlOption>
</wsdlOptions>
</configuration>
<goals>
<goal>wsdl2java</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>${build-helper-maven-plugin.version}</version>
<executions>
<execution>
<id>add-test-sources</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated/cxf</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
...
</plugins>
</build>