Hau*_*uke 6 java performance orm configuration hibernate
我们正在尝试将我们的项目从hibernate 3迁移到hibernate 4.一切都运行良好,但问题是启动.
我们不使用JPA,我们使用直接hibernate与xml文件和映射文件.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.informix.jdbc.IfxDriver</property>
<property name="hibernate.connection.url">jdbc:informix-sqli://xxx:xxx/xxx:INFORMIXSERVER=xxx</property>
<property name="hibernate.connection.username">xxx</property>
<property name="hibernate.connection.password">xxx</property>
<property name="hibernate.dialect">org.hibernate.dialect.InformixDialect</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.show_sql">false</property>
<property name="generated.mappingFile">dev.xml</property>
</session-factory>
</hibernate-configuration>
generated.mappingFile属性是一个自己的属性.启动时,将加载该文件(dev.xml).这个文件看起来像这样:
<mapping resource="de/cargosoft/edi/cargoservice/entities/aart/Aart_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/abteilung/Abteilung_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/adr/Adr_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/adraesort/Adraesort_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/adrakte/Adrakte_DEV.hbm.xml" />
...
<mapping resource="de/cargosoft/edi/cargoservice/entities/zollanmtxt/Zollanmtxt_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/sstbasis/Sstbasis_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/sststruktur/Sststruktur_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/ssthandler/Ssthandler_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/sstproperty/Sstproperty_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/sstprophandler/Sstprophandler_DEV.hbm.xml" />
<mapping resource="de/cargosoft/edi/cargoservice/entities/sstneustart/Sstneustart_DEV.hbm.xml" />
我们减少了这篇文章中的映射数量.我们目前有超过500个映射.
使用hibernate 3,加载所有映射需要2秒钟.使用hibernate 4需要2分钟.
这是来自hibernate 3.2.GA的日志文件:
07:36:21,293 INFO [HibernateManager ] | Verwende Mapping-Collection Datei : /com/cargosoft/csedi/data/mappings_dev.xml
07:36:21,347 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/aart/Aart_DEV.hbm.xml
07:36:21,443 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/abteilung/Abteilung_DEV.hbm.xml
07:36:21,458 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/adr/Adr_DEV.hbm.xml
07:36:21,495 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/adraesort/Adraesort_DEV.hbm.xml
07:36:21,523 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/adrakte/Adrakte_DEV.hbm.xml
...
07:36:23,475 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/zollanmtxt/Zollanmtxt_DEV.hbm.xml
07:36:23,477 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/sstbasis/Sstbasis_DEV.hbm.xml
07:36:23,479 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/sststruktur/Sststruktur_DEV.hbm.xml
07:36:23,481 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/ssthandler/Ssthandler_DEV.hbm.xml
07:36:23,482 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/sstproperty/Sstproperty_DEV.hbm.xml
07:36:23,484 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/sstprophandler/Sstprophandler_DEV.hbm.xml
07:36:23,486 INFO [HibernateManager ] | Adding this resource to hibernate now : com/cargosoft/csedi/data/sstneustart/Sstneustart_DEV.hbm.xml
07:36:23,488 INFO [HibernateManager ] | Create new SessionFactory for: jdbc:informix-sqli://...
随着hibernate 4.3.8-Final:
07:38:04,749 INFO [HibernateManager ] | Verwende Mapping-Collection Datei : /de/cargosoft/edi/cargoservice/entities/mappings_dev.xml
07:38:04,824 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/aart/Aart_DEV.hbm.xml
07:38:05,249 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/abteilung/Abteilung_DEV.hbm.xml
07:38:05,527 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/adr/Adr_DEV.hbm.xml
07:38:05,792 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/adraesort/Adraesort_DEV.hbm.xml
07:38:06,077 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/adrakte/Adrakte_DEV.hbm.xml
...
07:40:14,119 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/zollanmtxt/Zollanmtxt_DEV.hbm.xml
07:40:14,499 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/sstbasis/Sstbasis_DEV.hbm.xml
07:40:14,746 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/sststruktur/Sststruktur_DEV.hbm.xml
07:40:14,972 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/ssthandler/Ssthandler_DEV.hbm.xml
07:40:15,211 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/sstproperty/Sstproperty_DEV.hbm.xml
07:40:15,434 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/sstprophandler/Sstprophandler_DEV.hbm.xml
07:40:15,657 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/sstneustart/Sstneustart_DEV.hbm.xml
07:40:15,878 INFO [HibernateManager ] | Create new SessionFactory for: jdbc:informix-sqli://...
添加映射文件的方法如下所示:
for (Node node : nodes) {
Element element = (Element) node;
String resource = element.attributeValue("resource");
logger.info("Adding this resource to hibernate now : " + resource);
configuration.addResource(resource);
}
时间不足是在addResource上.
我们还通过将映射元素直接移动到hibernate.cfg.xml文件来尝试它,但启动时需要相同的时间.
我们相信hibernate正在验证hibernate 3没有的东西.
有人有想法解决这个问题吗？我们不能等待每个测试运行2分钟.
霍克,非常感谢和许多问候
UPDATE
我将loglevel更改为"DEBUG",现在它来了:
我改为loglevel进行调试,现在就出来了:
11:29:22,781 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/aart/Aart_DEV.hbm.xml
11:29:22,782 INFO [Configuration ] | HHH000221: Reading mappings from resource: de/cargosoft/edi/cargoservice/entities/aart/Aart_DEV.hbm.xml
11:29:22,804 DEBUG [DTDEntityResolver ] | Trying to resolve system-id [http://hibernate.org/dtd/hibernate-mapping-3.0.dtd]
11:29:23,149 INFO [HibernateManager ] | Adding this resource to hibernate now : de/cargosoft/edi/cargoservice/entities/abteilung/Abteilung_DEV.hbm.xml
...
因此,似乎DTDEntityResolver每个实体需要大约200ms - 400ms.有500个实体,这将总结.
所以问题是,如何禁用它？
您需要更改所有HBM配置文件的DTD:
http://hibernate.org/dtd/hibernate-mapping-3.0.dtd
至:
http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd
这是DTDEntityResolver尝试找到DTO的方法:
public class DTDEntityResolver implements EntityResolver, Serializable {
private static final String HIBERNATE_NAMESPACE = "http://www.hibernate.org/dtd/";
private static final String OLD_HIBERNATE_NAMESPACE = "http://hibernate.sourceforge.net/";
private static final String USER_NAMESPACE = "classpath://";
public InputSource resolveEntity(String publicId, String systemId) {
InputSource source = null; // returning null triggers default behavior
if ( systemId != null ) {
LOG.debugf( "Trying to resolve system-id [%s]", systemId );
if ( systemId.startsWith( HIBERNATE_NAMESPACE ) ) {
LOG.debug( "Recognized hibernate namespace; attempting to resolve on classpath under org/hibernate/" );
source = resolveOnClassPath( publicId, systemId, HIBERNATE_NAMESPACE );
}
else if ( systemId.startsWith( OLD_HIBERNATE_NAMESPACE ) ) {
LOG.recognizedObsoleteHibernateNamespace( OLD_HIBERNATE_NAMESPACE, HIBERNATE_NAMESPACE );
LOG.debug( "Attempting to resolve on classpath under org/hibernate/" );
source = resolveOnClassPath( publicId, systemId, OLD_HIBERNATE_NAMESPACE );
}
else if ( systemId.startsWith( USER_NAMESPACE ) ) {
LOG.debug( "Recognized local namespace; attempting to resolve on classpath" );
String path = systemId.substring( USER_NAMESPACE.length() );
InputStream stream = resolveInLocalNamespace( path );
if ( stream == null ) {
LOG.debugf( "Unable to locate [%s] on classpath", systemId );
}
else {
LOG.debugf( "Located [%s] in classpath", systemId );
source = new InputSource( stream );
source.setPublicId( publicId );
source.setSystemId( systemId );
}
}
}
return source;
}
...
}
Hibernate无法在中找到hibernate-mapping-3.0.dtd配置文件hibernate-core-4.3.8.Final.jar,所以它会通过所有类路径进行处理,因为你有一个庞大的项目,这就解释了为什么它开始这么慢.