Maven - how to run compile goal only once while using openjpa plugin

Question

When i run mvn clean compile openjpa:enhance install i noticed compile goal running twice - once before openjpa:enhance and after it (also with resources), which causes enhanced classes with openjpa:enhance to be discarded, because they are compiled again and rewritten.

How to change pom.xml or mvn command arguments so it will not run compile twice, but only once before openjpa:enhance? install at the end is needed.

pom.xml:

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>registry</groupId>
    <artifactId>datalayer</artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <properties>
        <maven.compiler.target>11</maven.compiler.target>
        <maven.compiler.source>11</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.sourceEncoding>UTF-8</project.reporting.sourceEncoding>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.1</version>
                </plugin>
                <plugin>
                    <groupId>org.apache.openjpa</groupId>
                    <artifactId>openjpa-maven-plugin</artifactId>
                    <version>3.1.2</version>
                    <configuration>
                        <includes>datalayer/dto/*.class</includes>
                        <addDefaultConstructor>true</addDefaultConstructor>
                        <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
                    </configuration>
                    <executions>
                        <execution>
                            <id>enhancer</id>
                            <phase>process-classes</phase>
                            <goals>
                                <goal>enhance</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.apache.openjpa</groupId>
            <artifactId>openjpa</artifactId>
            <version>3.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <version>10.15.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derbytools</artifactId>
            <version>10.15.2.0</version>
        </dependency>
    </dependencies>
</project>

output from mvn clean compile openjpa:enhance install:

[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< registry:openjpaenhancingtest >--------------------
[INFO] Building openjpaenhancingtest 0.0.1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ openjpaenhancingtest ---
[INFO] Deleting C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ openjpaenhancingtest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ openjpaenhancingtest ---
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jms.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jta.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target\classes
[INFO]
[INFO] --- openjpa-maven-plugin:3.1.2:enhance (default-cli) @ openjpaenhancingtest ---
88  DataLayer  INFO   [main] openjpa.Tool - Enhancer running on type "class entities.EntityPerson".
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ openjpaenhancingtest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ openjpaenhancingtest ---
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jms.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jta.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ openjpaenhancingtest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ openjpaenhancingtest ---
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jta.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jms.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ openjpaenhancingtest ---
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ openjpaenhancingtest ---
[INFO] Building jar: C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target\openjpaenhancingtest-0.0.1.jar
[INFO]
[INFO] --- maven-install-plugin:2.4:install (default-install) @ openjpaenhancingtest ---
[INFO] Installing C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target\openjpaenhancingtest-0.0.1.jar to C:\Users\wortigson\.m2\repository\registry\openjpaenhancingtest\0.0.1\openjpaenhancingtest-0.0.1.jar
[INFO] Installing C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\pom.xml to C:\Users\wortigson\.m2\repository\registry\openjpaenhancingtest\0.0.1\openjpaenhancingtest-0.0.1.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS

Answer 1

You need to add openjpa:enhance to the POM itself. Then you just run mvn clean install.