Hibernate中自引用類的問題

Question

我有一個建模父/子結構的實體，這是我的休眠映射文件：

<hibernate-mapping>
    <class name="myPackage.entities.Module"  table="MODULE">
        <id name="idModule" type="int">
            <column name="ID_MODULE" precision="6" scale="0" />
            <generator class="sequence">
                <param name="sequence">S_MODULE</param>
            </generator>
        </id>
        <property generated="never" lazy="false" name="nomModule"
            type="string">
            <column length="30" name="NOM_MODULE" />
        </property>
        ...
        <!-----------------Childs------------------------->         
        <set fetch="select" inverse="true" lazy="false" name="subModules"
            sort="unsorted" table="MODULE">
            <key>
                <column name="MOD_ID_MODULE" />
            </key>
            <one-to-many class="myPackage.entities.Module" />
        </set>
        <!-----------------parent------------------------->

        <many-to-one class="myPackage.entities.Module" name="parentModule">
            <column name="MOD_ID_MODULE"  />
        </many-to-one>

    </class>
</hibernate-mapping>

這是數據：

"ID_MODULE" "ID_APPLICATION" "MOD_ID_MODULE"(parent)  ...
"12"             "2"             "10"            
"10"             "2"             "3"     
"14"             "2"             "12"   
"1"                  "1"              ""    
"2"                  "1"             "1"    
"3"                  "2"             "" 
"4"                  "2"             "3"    
"13"             "2"             "4"    
"6"                  "1"             "2"    

我的問題是，每當我嘗試在視圖中顯示對象時，多對一關聯都會生成異常：

javax.servlet.ServletException: L'exécution de la servlet a lancé une exception
    org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

cause mère

java.lang.StackOverflowError
    java.lang.Exception.<init>(Exception.java:77)
    java.lang.reflect.InvocationTargetException.<init>(InvocationTargetException.java:54)
    sun.reflect.GeneratedMethodAccessor150.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:1773)
    org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1132)
    org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:686)
    org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
    org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:290)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:126)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:83)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:83)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:174)
    org.ajax4jsf.javascript.ScriptUtils.writeScriptToStream(ScriptUtils.java:83)
...

注意：我使用Hibernate，Spring和JSF

謝謝你的幫助

Answer 1

顯然，Ajax4JSF試圖將數據序列化為Javascript並陷入無限遞歸，因為對象圖是循環的（父級指向子級，子級指向父級）。 也許您需要找到一種方法來從Ajax4JSF序列化中排除“子對父”關系。

Answer 2

它看起來像一個無限循環。 您確定您的數據不包含自己的孩子的父母嗎？ 也可以是a-> b和b-> a或任何其他循環。