Erro JPA + EclipseLink

Prezados, bom dia.

Estou tendo problemas ao tentar gravar informações no banco de dados, eu tenho um simples WS com JPA, EclipseLink e banco Postgresql. Eu consigo buscar dados e apresentalos como json no browser com metodos GET, porém estou presisando também gravar dados(POST) e neste momento recebe mensagem de erro:

Info:   [EL Info]: 2017-01-04 09:12:44.568–ServerSession[telefone removido])–EclipseLink, version: Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd

Info:   [EL Info]: connection: 2017-01-04 09:12:45.542–ServerSession[telefone removido])–file:/D:/Documents/Projetos NetBeans/app/target/app/WEB-INF/classes/_persist-unit login successful

Severe:   javax.persistence.TransactionRequiredException:

Exception Description: No transaction is currently active

at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionWrapper.throwCheckTransactionFailedException(EntityTransactionWrapper.java:87)

at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionWrapper.checkForTransaction(EntityTransactionWrapper.java:50)

at org.eclipse.persistence.internal.jpa.EntityManagerImpl.checkForTransaction(EntityManagerImpl.java:2041)

at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:863)

at br.com.bigfarma.app.service.ProductService.addProduct(ProductService.java:32)

at br.com.bigfarma.app.resourse.ProductResource.addProduct(ProductResource.java:37)

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.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)

at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151)

at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:171)

at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:195)

at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:387)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:331)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:103)

at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:271)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)

at org.glassfish.jersey.internal.Errors.process(Errors.java:315)

at org.glassfish.jersey.internal.Errors.process(Errors.java:297)

at org.glassfish.jersey.internal.Errors.process(Errors.java:267)

at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:297)

at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:254)

at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1028)

at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:372)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:381)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:344)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:221)

at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)

at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)

at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)

at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)

at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)

at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)

at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)

at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)

at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)

at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)

at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)

at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)

at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)

at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)

at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)

at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)

at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)

at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)

at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)

at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)

at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)

at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)

at java.lang.Thread.run(Thread.java:745)

ProductService:

package br.com.bigfarma.app.service;

import br.com.bigfarma.app.entity.TbProduto;

import java.util.Collection;

import javax.persistence.EntityManager;

import javax.persistence.EntityTransaction;

import javax.persistence.FlushModeType;

/**
*

@author jhonathan.maia
*/
public class ProductService extends AbstractEntityManager {

public Collection getAllProducts() {

return getEm().createQuery(TbProduto.BASE_QUERY).getResultList();

}

public TbProduto addProduct(TbProduto tbProduto) {

EntityManager em = getEm();

em.setFlushMode(FlushModeType.COMMIT);

EntityTransaction et = getEm().getTransaction();

try {

et.begin();

if(!em.contains(tbProduto)){

em.persist(tbProduto);

em.flush(); //LOCAL DO ERRO

}

et.commit();

return tbProduto;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

//	public TbProduto editProduct(Long id) {

//

//	}

//

//	public TbProduto deleteProduct(Long id) {

//

//	}

}

PERSISTENCE.XML:

<?xml version="1.0" encoding="UTF-8"?> org.eclipse.persistence.jpa.PersistenceProvider java:app/MyApp br.com.bigfarma.app.entity.TbUsuario br.com.bigfarma.app.entity.TbProduto br.com.bigfarma.app.entity.TbCategoria true

POM.XML:

<modelVersion>4.0.0</modelVersion>

<groupId>br.com.bigfarma</groupId>
<artifactId>app</artifactId>
<packaging>war</packaging>
<version>1.0</version>
<name>app</name>

<build>
    <finalName>app</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5.1</version>
            <inherited>true</inherited>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <!--JERSEY DEPENDENCES-->
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
        <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
        <!-- artifactId>jersey-container-servlet</artifactId -->
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
    </dependency>
    <!-- JPA/ECLIPSE LINK DEPENDENCES -->
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>javax.persistence</artifactId>
        <version>2.1.0</version>
    </dependency>

<dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.4-1201-jdbc41</version>
    </dependency>
    
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>eclipselink</artifactId>
        <version>2.5.2</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
        <version>2.5.2</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>jta</artifactId>
        <version>1.1</version>
        <scope>provided</scope>
    </dependency>
</dependencies>
<properties>
    <jersey.version>2.25</jersey.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

A IDE é o Netbeans 8.1 com Glassfish 4.0.

Agradeço desde já.

Abs.

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