運行我的單元測試時發生MismatchedTokenException

Question

我嘗試運行與我的Dao類相關的測試時遇到問題。它說解析我的查詢時出現語法錯誤。但爲什麼 ？

Render.java：

@Entity 
@Table(name = "ORR_RENDERS") 
@NamedQueries({ 
    @NamedQuery(name = Render.FIND_RENDERS_AVAILABLE, 
      query = "SELECT COUNT(r) Render r WHERE r.scene.id = :sceneId AND r.status = :status") 
}) 
@Inheritance(strategy = InheritanceType.SINGLE_TABLE) 
@DiscriminatorColumn(name = "RENDER_TYPE") 
@EntityListeners(EntityListener.class) 
public abstract class Render extends AbstractORREntity { 

public static final String FIND_RENDERS_AVAILABLE = "Render.findRendersAvailable"; 

@Id 
@GeneratedValue(generator = "renderSeq") 
@SequenceGenerator(name = "renderSeq", sequenceName = "ORR_REND_SEQ", allocationSize = 1) 
@Column(name = "IDS") 
private Long id; 

@ManyToOne 
@NotNull(message = "The scene cannot be null.") 
@JoinColumn(name = "SCEN_IDS", referencedColumnName = "IDS", nullable = false) 
private Scene scene; 

@NotNull(message = "The status cannot be null.") 
@Enumerated(EnumType.STRING) 
@Column(name = "STATUS") 
private RenderStatus status; 

RenderDaoImpl.java方法：

@Override 
public Long findAmountOfRendersAvailableForScene(Long sceneId) { 
    return entityManager.createNamedQuery(Render.FIND_RENDERS_AVAILABLE, Long.class) 
      .setParameter("sceneId", sceneId) 
      .setParameter("status", RenderStatus.DONE) 
      .getSingleResult(); 
} 

RenderStatus.java

public enum RenderStatus { 

    DONE, 
    NOT_REQUESTED, 
    WAITING, 
    IN_PROGRESS, 
    FAILED 
} 

堆棧跟蹤

javax.persistence.PersistenceException: Exception [EclipseLink-8024] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.JPQLException 
Exception Description: Syntax error parsing the query [Render.findRendersAvailable: SELECT COUNT(r) Render r WHERE r.scene.id = :sceneId AND r.status = :status], line 1, column 23: syntax error at [r]. 
Internal Exception: MismatchedTokenException(78!=32) 

at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:397) 
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:151) 
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:207) 
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:195) 
at com.agc.test.common.persistence.PersistenceTestCase.createEntityManager(PersistenceTestCase.java:75) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56) 
at java.lang.reflect.Method.invoke(Method.java:620) 
at org.junit.internal.runners.MethodRoadie.runBefores(MethodRoadie.java:132) 
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:95) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:300) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:288) 
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86) 
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:208) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:147) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:121) 
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33) 
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:123) 
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121) 
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53) 
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59) 

由於這個錯誤，我也有一個NullPointerException，因爲它看起來像我的EntityManager是不可檢索：

java.lang.NullPointerException 
at com.agc.test.common.persistence.PersistenceTestCase.getTransaction(PersistenceTestCase.java:132) 
at com.agc.test.common.persistence.PersistenceTestCase.after(PersistenceTestCase.java:254) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56) 
at java.lang.reflect.Method.invoke(Method.java:620) 
at org.junit.internal.runners.MethodRoadie.runAfters(MethodRoadie.java:149) 
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:101) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:300) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:288) 
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86) 
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:208) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:147) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:121) 
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33) 
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45) 
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:123) 
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121) 
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53) 
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59) 

Answer 1

你從丟失。

SELECT COUNT(r) Render r WHERE r.scene.id = :sceneId AND r.status = :status 

應該像

SELECT COUNT(r) FROM Render r WHERE r.scene.id = :sceneId AND r.status = :status