Re: n <-> m relations on 1r7

Armin Waibel Wed, 07 Jul 2004 15:44:50 -0700

Hi Jim,

> java.lang.NullPointerException > at > org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.associateBatched(Unknown

> Source)

this stack trace didn't help much. Please compile the OJB jar with
'ant jar-debug' to get the line number of the NPE.

There is a test case (M2NTest.java) in OJB test-suite query objects with m:n relation and this test pass. By the way, did you tried to use OJB 1.0?

regards,
Armin


Jim Theodoridis wrote:

Hi
I am using ojb 1r7 struts and tomcat 5.0
the following declarations works fine on ojb 0.7
I am having n<->m relation Author <-> Document in the database i use table writes like this Author ----> Writes <------ Document the repository_user.xml about class Document is:

  <class-descriptor
        class="gr.tera.encyclopedia.bo.DocumentBO"
        table="DOCUMENT"
  >
     <field-descriptor
        name="id"
        column="DOCUMENTID"
        jdbc-type="INTEGER"
        primarykey="true"
        autoincrement="true"
     />
     <field-descriptor
        name="year"
        column="DOCUMENTYEAR"
        jdbc-type="INTEGER"
     />
     <field-descriptor
        name="categoryID"
        column="DOCUMENTCATEGORYID"
        jdbc-type="INTEGER"
     />
     <field-descriptor
        name="kindID"
        column="DOCUMENTKINDID"
        jdbc-type="INTEGER"
     />
     <field-descriptor
        name="name"
        column="DOCUMENTTITLE"
        jdbc-type="VARCHAR"
     />
     
     <collection-descriptor
        name="authors"
        element-class-ref="gr.tera.encyclopedia.bo.AuthorBO"
        auto-retrieve="true"
        auto-update="true"
        indirection-table="WRITES"
        orderby="AUTHORNAME"
     >
        <fk-pointing-to-this-class column="DOCUMENTID"/>
        <fk-pointing-to-element-class column="AUTHORID"/>
     </collection-descriptor>
 </class-descriptor>
......
When i am trying to get a collection of documents i am taking the following error

java.lang.NullPointerException at org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.associateBatched(Unknown Source) at org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.prefetchRelationship(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at gr.tera.encyclopedia.service.EncyclopediaServiceImpl.getDocuments(EncyclopediaServiceImpl.java:104)

at org.apache.jsp.showDocuments$jsp._jspService(showDocuments$jsp.java:71) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)

at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)

at java.lang.Thread.run(Thread.java:536) org.apache.ojb.broker.PersistenceBrokerException: java.lang.NullPointerException at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at gr.tera.encyclopedia.service.EncyclopediaServiceImpl.getDocuments(EncyclopediaServiceImpl.java:104)

at org.apache.jsp.showDocuments$jsp._jspService(showDocuments$jsp.java:71) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)

at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)

at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)

at java.lang.Thread.run(Thread.java:536) Caused by: java.lang.NullPointerException at org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.associateBatched(Unknown Source) at org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.prefetchRelationship(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) ... 41 more
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Re: n <-> m relations on 1r7

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