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如何从外部JAR加载Hibernate实体(How to load Hibernate entities from external JAR)

 我试图从几个jar文件加载实体。 我设法做的是  
 
  配置hibernate 
private void configure(File[] moduleFiles)
{
Configuration configuration = new Configuration()
    .setProperty("hibernate.connection.url", getConnectionString())
    .setProperty("hibernate.connection.username", "user")
    .setProperty("hibernate.connection.password", "pass")
    .setProperty("hibernate.connection.driver_class", "org.hsqldb.jdbc.JDBCDriver")
    .setProperty("hibernate.dialect", "org.hibernate.dialect.HSQLDialect")
    .setProperty("hibernate.archive.autodetection", "class,hbm")
    .setProperty("exclude-unlisted-classes", "false")
    .setProperty("hibernate.hbm2ddl.auto", "update");

if (moduleFiles != null) {
    for (File f : moduleFiles) {
        configuration.addJar(f);
    }
}

ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
this.sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
 
 
 所以实体应该从moduleFiles数组加载。 在日志中，我可以看到：  
    2015-08-25 20:52:12 INFO  Configuration:837 - HHH000235: Searching for mapping documents in jar: ProgramInfo.jar
    2015-08-25 20:52:12 INFO  Configuration:837 - HHH000235: Searching for mapping documents in jar: SampleModule.jar
 
 
  外部jar中的实体 
@Entity
@Table(name = "PROGRAMINFO_DATA", schema = "PUBLIC", catalog = "PUBLIC")
@NamedQueries({@NamedQuery(name = "PrograminfoDataEntity.findByWindowInfo", query = "FROM PrograminfoDataEntity WHERE PROCESSPATH = :pp AND WINDOWTITLE = :wt AND DAY = :d")})
public class PrograminfoDataEntity implements SVEntity {
    private long id;
    private Date day;
    private String processname;
    private String processpath;
    private String programname;
    private String windowtitle;

    // getters setters etc.
}
 
  外部jar中的persistence.xml（META-INF目录） 
<persistence-unit name="ProgramInfoPersistenceUnit">
    <class>com.antara.modules.programinfo.db.model.PrograminfoDataEntity</class>
</persistence-unit>
 
  查询以上实体用法 
    Session session = openSession();
    Query q = session.getNamedQuery("PrograminfoDataEntity.findByWindowInfo");
    q.setParameter("pp", windowInfo.getProcessPath());
    q.setParameter("wt", windowInfo.getWindowTitle());
    q.setDate("d", date);

    PrograminfoDataEntity result = (PrograminfoDataEntity) q.uniqueResult();
    closeSession(session);
 
 
 哪个例外：  
org.hibernate.MappingException: Named query not known: PrograminfoDataEntity.findByWindowInfo
    at org.hibernate.internal.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:177)
    at org.hibernate.internal.SessionImpl.getNamedQuery(SessionImpl.java:1372)
    at com.antara.modules.programinfo.db.dao.PrograminfoDao.findByWindowInfo(PrograminfoDao.java:26)
    at com.antara.modules.programinfo.ProgramInfoImpl.run(ProgramInfoImpl.java:84)
 
 问题是为什么hibernate没有从jar加载带注释的实体？ 异常不仅由命名查询引发，而且还与实体的任何其他操作引发异常。 使用此实体前没有错误。 本地实体已正确加载。  
 编辑：  
 经过一些更改后，我设法通过Hibernate识别实体  
DEBUG AnnotationBinder:601 - Binding entity from annotated class: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
DEBUG QueryBinder:93 - Binding named query: PrograminfoDataEntity.findByWindowInfo => FROM PrograminfoDataEntity ....
 
 但是当我尝试使用该实体时，我仍然会遇到异常：  
ERROR AssertionFailure:61 - HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): java.lang.ClassNotFoundException: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
ERROR Main:114 - PersistentClass name cannot be converted into a Class
...
Caused by: java.lang.ClassNotFoundException: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
 
 更改是：将配置传递给jar中的每个“模块”并添加Annotated Class（模块我指的是SPI服务，启动时调用方法）  
@Override
public void configureDB(Configuration configuration) {
    configuration.addAnnotatedClass(PrograminfoDataEntity.class);
}

I am trying to load entities from several jar files. What I managed to do is  
 
 configure hibernate
 private void configure(File[] moduleFiles)
{
Configuration configuration = new Configuration()
    .setProperty("hibernate.connection.url", getConnectionString())
    .setProperty("hibernate.connection.username", "user")
    .setProperty("hibernate.connection.password", "pass")
    .setProperty("hibernate.connection.driver_class", "org.hsqldb.jdbc.JDBCDriver")
    .setProperty("hibernate.dialect", "org.hibernate.dialect.HSQLDialect")
    .setProperty("hibernate.archive.autodetection", "class,hbm")
    .setProperty("exclude-unlisted-classes", "false")
    .setProperty("hibernate.hbm2ddl.auto", "update");

if (moduleFiles != null) {
    for (File f : moduleFiles) {
        configuration.addJar(f);
    }
}

ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
this.sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
 
 
so the entities should be loaded from moduleFiles array. In logs I can see: 
    2015-08-25 20:52:12 INFO  Configuration:837 - HHH000235: Searching for mapping documents in jar: ProgramInfo.jar
    2015-08-25 20:52:12 INFO  Configuration:837 - HHH000235: Searching for mapping documents in jar: SampleModule.jar
 
 
 The entity in external jar
 @Entity
@Table(name = "PROGRAMINFO_DATA", schema = "PUBLIC", catalog = "PUBLIC")
@NamedQueries({@NamedQuery(name = "PrograminfoDataEntity.findByWindowInfo", query = "FROM PrograminfoDataEntity WHERE PROCESSPATH = :pp AND WINDOWTITLE = :wt AND DAY = :d")})
public class PrograminfoDataEntity implements SVEntity {
    private long id;
    private Date day;
    private String processname;
    private String processpath;
    private String programname;
    private String windowtitle;

    // getters setters etc.
}
 
 persistence.xml in external jar (META-INF directory)
  
 <persistence-unit name="ProgramInfoPersistenceUnit">
    <class>com.antara.modules.programinfo.db.model.PrograminfoDataEntity</class>
</persistence-unit>
  
 Query with above entity usage
     Session session = openSession();
    Query q = session.getNamedQuery("PrograminfoDataEntity.findByWindowInfo");
    q.setParameter("pp", windowInfo.getProcessPath());
    q.setParameter("wt", windowInfo.getWindowTitle());
    q.setDate("d", date);

    PrograminfoDataEntity result = (PrograminfoDataEntity) q.uniqueResult();
    closeSession(session);
 
 
which threw an exception: 
org.hibernate.MappingException: Named query not known: PrograminfoDataEntity.findByWindowInfo
    at org.hibernate.internal.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:177)
    at org.hibernate.internal.SessionImpl.getNamedQuery(SessionImpl.java:1372)
    at com.antara.modules.programinfo.db.dao.PrograminfoDao.findByWindowInfo(PrograminfoDao.java:26)
    at com.antara.modules.programinfo.ProgramInfoImpl.run(ProgramInfoImpl.java:84)
 
The question is why hibernate didn't loaded the annotated entity from jar? The exception is thrown not only by named query, but any other operation with entity. There are no errors before usage of this entity. Local entities are loaded properly. 
EDIT: 
After some changes I managed to recognize entity by Hibernate 
DEBUG AnnotationBinder:601 - Binding entity from annotated class: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
DEBUG QueryBinder:93 - Binding named query: PrograminfoDataEntity.findByWindowInfo => FROM PrograminfoDataEntity ....
 
But when I try to use the entity I still get exception: 
ERROR AssertionFailure:61 - HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): java.lang.ClassNotFoundException: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
ERROR Main:114 - PersistentClass name cannot be converted into a Class
...
Caused by: java.lang.ClassNotFoundException: com.antara.modules.programinfo.db.model.PrograminfoDataEntity
 
The change was: passing Configuration to each "module" that is inside jar and add Annotated Class (by module I mean SPI service with method invoked at startup) 
@Override
public void configureDB(Configuration configuration) {
    configuration.addAnnotatedClass(PrograminfoDataEntity.class);
}

原文：https://stackoverflow.com/questions/32214935

更新时间：2023-05-25 16:05

最满意答案

 根据您的预期输出，您似乎有兴趣选择距离大于 0.4的点对（这与您的问题描述不符）。 如果是这种情况，您可以尝试以下方法：  
dist_pairs <- which(df1!=0 & df1 > 0.4, arr.ind=TRUE)
dist_pairs[] <- sapply(dist_pairs, function(x) x <- letters[x])
> dist_pairs
#     row col
#[1,] "c" "a"
#[2,] "c" "b"
#[3,] "a" "c"
#[4,] "b" "c"
 
 否则，如果您希望这些对低于阈值0.4，请将>符号更改为<符号。  
 数据  
df1 <- structure(list(a = c(0, 0.2, 0.5), b = c(0.2, 0, 0.6), 
c = c(0.5, 0.6, 0)), .Names = c("a", "b", "c"), class = "data.frame", 
row.names = c(NA, -3L))

According to your expected output, you seem to be interested in selecting pairs of points with distances greater than 0.4 (which does not correspond to your problem description). If this is the case, you could try the following: 
dist_pairs <- which(df1!=0 & df1 > 0.4, arr.ind=TRUE)
dist_pairs[] <- sapply(dist_pairs, function(x) x <- letters[x])
> dist_pairs
#     row col
#[1,] "c" "a"
#[2,] "c" "b"
#[3,] "a" "c"
#[4,] "b" "c"
 
Else, if you want those pairs below the threshold of 0.4, change the > sign to a < sign. 
data 
df1 <- structure(list(a = c(0, 0.2, 0.5), b = c(0.2, 0, 0.6), 
c = c(0.5, 0.6, 0)), .Names = c("a", "b", "c"), class = "data.frame", 
row.names = c(NA, -3L))

如何从外部JAR加载Hibernate实体(How to load Hibernate entities from external JAR)

最满意答案

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