Java EE Netbeans Maven EJB Module (MySQL) Error

Question

I am using Netbeans 7.3.1 and glassfish 4.0. I've created a simple Maven EJB Project. What I'm trying to do is simply delete one row from my table (MySQL Database). I keep getting this error:

    Error occurred during deployment: Exception while loading the app : javax.ejb.CreateException: Initialization failed for Singleton MyTester. Please see server.log for more details.
The module has not been deployed.
See the server log for details.
    at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:210)
    at org.netbeans.modules.maven.j2ee.ExecutionChecker.performDeploy(ExecutionChecker.java:178)
    at org.netbeans.modules.maven.j2ee.ExecutionChecker.executionResult(ExecutionChecker.java:130)
    at org.netbeans.modules.maven.execute.MavenCommandLineExecutor.run(MavenCommandLineExecutor.java:212)
    at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)

Session Bean:

package com.mycompany.myapp1;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.ejb.Stateless;
import javax.ejb.LocalBean;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.apache.commons.io.IOUtils;

@Singleton
@LocalBean
@Startup
public class MyTester {

@PersistenceContext(name="com.mycompany_myApp1_ejb_1.0-SNAPSHOTPU")
EntityManager em;
    @PostConstruct
    public void myMain(){
        Staff staff = em.find(Staff.class, 5);
        System.out.println("deleting...");
        em.remove(staff);
    }
}

Staff.java:

package com.mycompany.myapp1;

import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.validation.constraints.Size;

@Entity
public class Staff implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer staffId;

    private String name;
    @Column(name = "age")
    private Integer age;

    private String gender;
    @Column(name = "salary")
    private Integer salary;

    @Lob
    private byte[] pic;

    public byte[] getPic() {
        return pic;
    }

    public void setPic(byte[] pic) {
        this.pic = pic;
    }

    public Staff() {
    }

    public Staff(Integer staffId) {
        this.staffId = staffId;
    }

    public Integer getStaffId() {
        return staffId;
    }

    public void setStaffId(Integer staffId) {
        this.staffId = staffId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public Integer getSalary() {
        return salary;
    }

    public void setSalary(Integer salary) {
        this.salary = salary;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (staffId != null ? staffId.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Staff)) {
            return false;
        }
        Staff other = (Staff) object;
        if ((this.staffId == null && other.staffId != null) || (this.staffId != null && !this.staffId.equals(other.staffId))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "com.mycompany.myapp1.Staff[ staffId=" + staffId + " ]";
    }

    void getGender(String m) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

}

POM:

<?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.mycompany</groupId>
    <artifactId>myApp1</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>ejb</packaging>

    <name>myApp1</name>

    <properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>eclipselink</artifactId>
            <version>2.5.0-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.1.0-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
            <version>2.5.0-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-ejb-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <ejbVersion>3.1</ejbVersion>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <url>http://download.eclipse.org/rt/eclipselink/maven.repo/</url>
            <id>eclipselink</id>
            <layout>default</layout>
            <name>Repository for library EclipseLink (JPA 2.1)</name>
        </repository>
    </repositories>
</project>

persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="com.mycompany_myApp1_ejb_1.0-SNAPSHOTPU" transaction-type="JTA">
    <jta-data-source>asas</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties/>
  </persistence-unit>
</persistence>

The thing is if I want to just add a row to the table for example:

public void myMain(){
Staff staff = new Staff();
staff.setName("John");
staff.setAge(22);
em.persist(staff);
}

I get no errors, all just work fine and I see the result in my database! Please help. Also if I change state from @Singleton to @Stateless or @Stateful there is no errors, but database does not change. What is going on?

Answer 1

Today I tried to run my application again. After I clicked run, Netbeans starts downloading some stuff. And turns out everything works fine! I got one warning:

WARNING:   Class 'javax.ejb.PostActivate' not found, interception based on it is not enabled

but my application was successfully deployed and record has been removed from the table! This is really weird but turns out restarting netbeans fixed the issue.