How to make a standalone JPA (with OpenJPA implementation) Maven project start with exec maven plugin? - maven

Question

I have a very simple JPA project. This is my directory layout..
/src
/main
/java
/biz
/tugay
/jpaExamples
App.java
/model
Person.java
/resources
/META-INF
persistence.xml
So it is pretty standard maven directory layout. This is my 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
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>biz.tugay</groupId>
<artifactId>jpa-examples</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>jpa-examples</name>
<url>http://www.tugay.biz</url>
<dependencies>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<version>2.4.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa-persistence</artifactId>
<version>2.4.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.192</version>
</dependency>
</dependencies>
<build>
<finalName>bare-maven-project</finalName>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>biz.tugay.jpaExamples.App</mainClass>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>
and persistence.xml
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="jpaExamples" transaction-type="RESOURCE_LOCAL">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<class>biz.tugay.jpaExamples.model.Person</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:~/sampleh2db;TRACE_LEVEL_FILE=0"/>
<property name="javax.persistence.jdbc.user" value="test"/>
<property name="javax.persistence.jdbc.password" value="test"/>
<property name="openjpa.Log" value="DefaultLevel=ERROR, Tool=ERROR"/>
</properties>
</persistence-unit>
Finally, App.java
package biz.tugay.jpaExamples;
import biz.tugay.jpaExamples.model.Person;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import java.sql.*;
public class App {
private static final String PERSISTENCE_UNIT_NAME = "jpaExamples";
private static final EntityManagerFactory ENTITY_MANAGER_FACTORY = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
public static void main(String[] args) throws ClassNotFoundException, SQLException {
final EntityManager entityManager = ENTITY_MANAGER_FACTORY.createEntityManager();
final Person person = entityManager.find(Person.class, 1L);
System.out.println(person);
entityManager.close();
ENTITY_MANAGER_FACTORY.close();
}
}
When I execute App.java from IntelliJ, all is fine. I will see the output:
Person{id=1, firstname='Koray', lastname='Tugay', address='Yıldız Cd. 43 / 30', city='İstanbul'}
This is what IntelliJ generates, when running main in App.java
"C:\Program Files\Java\jdk1.8.0_121\bin\java" -Didea.launcher.port=7534 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_121\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_121\jre\lib\rt.jar;C:\Users\Koray Tugay\Desktop\jpa-examples\target\classes;C:\Users\Koray Tugay\.m2\repository\org\eclipse\persistence\javax.persistence\2.1.1\javax.persistence-2.1.1.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\openjpa\openjpa\2.4.2\openjpa-2.4.2.jar;C:\Users\Koray Tugay\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\Koray Tugay\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\Koray Tugay\.m2\repository\net\sourceforge\serp\serp\1.15.1\serp-1.15.1.jar;C:\Users\Koray Tugay\.m2\repository\junit\junit\3.8.1\junit-3.8.1.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\geronimo\specs\geronimo-jms_1.1_spec\1.1.1\geronimo-jms_1.1_spec-1.1.1.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\geronimo\specs\geronimo-jta_1.1_spec\1.1.1\geronimo-jta_1.1_spec-1.1.1.jar;C:\Users\Koray Tugay\.m2\repository\commons-pool\commons-pool\1.6\commons-pool-1.6.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\xbean\xbean-asm5-shaded\3.17\xbean-asm5-shaded-3.17.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\geronimo\specs\geronimo-jpa_2.0_spec\1.1\geronimo-jpa_2.0_spec-1.1.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\openjpa\openjpa-persistence\2.4.2\openjpa-persistence-2.4.2.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\openjpa\openjpa-kernel\2.4.2\openjpa-kernel-2.4.2.jar;C:\Users\Koray Tugay\.m2\repository\org\apache\openjpa\openjpa-lib\2.4.2\openjpa-lib-2.4.2.jar;C:\Users\Koray Tugay\.m2\repository\com\h2database\h2\1.4.192\h2-1.4.192.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.3\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain biz.tugay.jpaExamples.App
so I am pretty sure everything related to my persistence.xml configuration and dependencies are fine..
When I try mvn exec:java (after mvn clean install) I get:
[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:297)
at java.lang.Thread.run(Thread.java:745)
Caused by: <openjpa-2.4.2-r422266:1777108 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: This configuration disallows runtime optimization, but the following listed types were not enhanced at build time or at class load time with a javaagent: "
biz.tugay.jpaExamples.model.Person".
at org.apache.openjpa.enhance.ManagedClassSubclasser.prepareUnenhancedClasses(ManagedClassSubclasser.java:115)
at org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTypes(AbstractBrokerFactory.java:311)
at org.apache.openjpa.kernel.AbstractBrokerFactory.initializeBroker(AbstractBrokerFactory.java:235)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:211)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:154)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
at biz.tugay.jpaExamples.App.main(App.java:16)
... 6 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.240 s
[INFO] Finished at: 2017-05-24T22:32:46+03:00
[INFO] Final Memory: 11M/139M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project jpa-examples: An exception occured while executing the Java class. null: InvocationTargetException: This configuration disallows runtime optimization, but the following listed types were not enhanced at build time or at class load time with a javaagent: "
[ERROR] biz.tugay.jpaExamples.model.Person".
How do I fix this? I think somehow OpenJPA is unable to find persistence.xml, but I can verify that it is found under target/classes.

Answer 1

Adding this to pom.xml worked:
<plugin>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa-maven-plugin</artifactId>
<version>2.4.2</version>
<configuration>
<includes>**/model/*.class</includes>
<excludes>**/model/XML*.class</excludes>
<addDefaultConstructor>true</addDefaultConstructor>
<enforcePropertyRestrictions>true</enforcePropertyRestrictions>
</configuration>
<executions>
<execution>
<id>enhancer</id>
<phase>process-classes</phase>
<goals>
<goal>enhance</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<!-- set the version to be the same as the level in your runtime -->
<version>2.4.2</version>
</dependency>
</dependencies>
</plugin>