Ich habe zwei Maven-Unterprojekte - jetty_runner1 und jetty_runner2

Meine Verzeichnisstruktur sieht folgendermaßen aus:

./jetty_runner1/pom.xml
./jetty_runner1/src/main/java/com/jetty_runner1/CheckPersistence.java
./jetty_runner1/src/main/java/com/jetty_runner1/HelloWorldServlet.java
./jetty_runner1/src/main/java/com/jetty_runner1/MiscKeyValue.java
./jetty_runner1/src/main/java/com/jetty_runner1/MiscKeyValueManager.java
./jetty_runner1/src/main/resources/META-INF/persistence.xml
./jetty_runner1/src/main/webapp/WEB-INF/web.xml


./jetty_runner2/pom.xml
./jetty_runner2/src/main/java/com/jetty_runner2/CheckPersistence.java
./jetty_runner2/src/main/java/com/jetty_runner2/HelloWorldServlet.java
./jetty_runner2/src/main/resources/META-INF/persistence.xml
./jetty_runner2/src/main/webapp/WEB-INF/web.xml


./pom.xml

CheckPersistence.java, HelloWorldServlet.java, persistence.xml und web.xml sind in beiden Projekten bis auf die Paketnamen identisch (ich habe dieses vereinfachte Beispiel für das Posten hier erstellt. In der tatsächlichen Anwendung sind die beiden Unterprojekte identisch mache wild verschiedene Dinge)

Hier sind die tatsächlichen Dateiinhalte:

CheckPersistence.java

public class CheckPersistence
{
    public void beginUpdation()
    {
        String val = null;
        List<MiscKeyValue> keyValues = MiscKeyValueManager.get().selectStar();
        if (keyValues != null && keyValues.size() == 1)
            val = keyValues.get(0).getStringValue();
        if (val == null)
            val = "Hello World";

        MiscKeyValue keyValue = new MiscKeyValue();
        keyValue.setStringKey("modifiedDate");
        keyValue.setStringValue(val);
        MiscKeyValueManager.get().put(keyValue);
    }
}

HelloWorldServlet.java

public class HelloWorldServlet extends HttpServlet
{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    {
        new CheckPersistence().beginUpdation();
    }
}

MiscKeyValue.java

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity (name="Misc_Key_Value")
public class MiscKeyValue
{
    @Id
    @Column(name="Misc_Key_Value_id")
    private String id;

    @Column(name="string_key")
    private String stringKey;

    @Column(name="string_value")
    private String stringValue;

    public String getId()
    {
        return id;
    }
    public void setId(String id)
    {
        this.id = id;
    }
    public String getStringKey()
    {
        return stringKey;
    }
    public void setStringKey(String stringKey)
    {
        this.stringKey = stringKey;
    }
    public String getStringValue()
    {
        return stringValue;
    }
    public void setStringValue(String stringValue)
    {
        this.stringValue = stringValue;
    }
}

MiscKeyValueManager.java

import java.util.List;
import java.util.UUID;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import com.mysema.query.jpa.impl.JPAQuery;

public class MiscKeyValueManager
{
    private static MiscKeyValueManager INSTANCE = new MiscKeyValueManager();
    protected EntityManagerFactory emf;
    public static QMiscKeyValue qmiscKeyValue = QMiscKeyValue.miscKeyValue;

    private MiscKeyValueManager()
    {
        this.emf = Persistence.createEntityManagerFactory("world");
    }

    public static MiscKeyValueManager get()
    {
        return INSTANCE;
    }

    public List<MiscKeyValue> selectStar()
    {
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();
        JPAQuery query = new JPAQuery(em);
        List<MiscKeyValue> results = query.from(qmiscKeyValue)
                .fetchAll().list(qmiscKeyValue);
        tx.commit();
        em.close();
        return results;
    }

    public MiscKeyValue put(MiscKeyValue e)
    {
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();
        if (e.getId() == null)
        {
            e.setId(UUID.randomUUID().toString());
        }
        MiscKeyValue mergedE = em.merge(e);
        em.flush();
        tx.commit();
        em.clear();
        em.close();
        return mergedE;
    }
}

persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
        version="2.0">
    <persistence-unit name="world">
      <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
      <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/world"/>
        <property name="javax.persistence.jdbc.user" value="root"/>
        <property name="javax.persistence.jdbc.password" value="password"/>
        <property name="hibernate.format_sql" value="true"/>
      </properties>
    </persistence-unit>
</persistence>

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
   version="2.5"
   metadata-complete="true">
  <servlet>
    <servlet-name>Hello</servlet-name>
    <servlet-class>com.jetty_runner1.HelloWorldServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Hello</servlet-name>
    <url-pattern>/hello/*</url-pattern>
  </servlet-mapping>
</web-app>

Jede pom.xml enthält auch das QueryDSL- und das Jetty-Plugin:

<build>
  <plugins>
   <plugin>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-maven-plugin</artifactId>
      <version>${jettyVersion}</version>
    </plugin>
    <plugin>
      <groupId>com.mysema.maven</groupId>
      <artifactId>apt-maven-plugin</artifactId>
      <version>1.1.3</version>
      <executions>
        <execution>
          <goals>
            <goal>process</goal>
          </goals>
          <configuration>
            <outputDirectory>target/generated-sources/java</outputDirectory>
            <processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>
          </configuration>
        </execution>
      </executions>
      <dependencies>
        <dependency>
          <groupId>com.mysema.querydsl</groupId>
          <artifactId>querydsl-apt</artifactId>
          <version>${querydsl.version}</version>
        </dependency>
      </dependencies>
    </plugin>
  </plugins>
</build>

Wenn ich renne MVN Jetty: Run von jetty_runner1 und drücke die URL localhost: 8080 / hello /, alles funktioniert einwandfrei, in dem Sinne, dass die Abfrage ausgeführt und aktualisiert wird.

Wenn ich dasselbe von jetty_runner2 aus starte und auf dieselbe URL treffe, gibt es eine Ausnahme, die besagt:

org.hibernate.hql.internal.ast.QuerySyntaxException: Misc_Key_Value ist nicht zugeordne

at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79)
at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150)
at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:298)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:236)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1821)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:291)
at com.mysema.query.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:129)
at com.mysema.query.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:96)
at com.mysema.query.jpa.impl.AbstractJPAQuery.list(AbstractJPAQuery.java:248)
at com.jetty_runner1.MiscKeyValueManager.selectStar(MiscKeyValueManager.java:35)
at com.jetty_runner2.CheckPersistence.beginUpdation(CheckPersistence.java:13)
at com.jetty_runner2.HelloWorldServlet.doGet(HelloWorldServlet.java:16)