Hibernate异常javassist

Question

我需要一些帮助，因为我在Hibernate 4/Struts2项目中遇到了困难。这是我的第一个Hibernate 4 (4.3.11)项目，因为我已经使用Hibernate 3多年了。数据库是MySQL 5。

所有的映射类都是在Eclipse mars2上使用JBoss Tools 4.3.5提供的Hibernate工具生成的，没有遇到任何问题，工作正常。

但在测试时，我遇到了这样的异常：

2017-02-16 17:23:45 ERROR Dispatcher:38 - Exception occurred during processing request: metier.Ville_$$_javassist_2 cannot be cast to javassist.util.proxy.Proxy

java.lang.ClassCastException:无法将org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:75)在org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:771)的org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:147)处的metier.Ville_$$_javassist_2转换为javassist.util.proxy.Proxy

我读了that post，但我不明白发生了什么。

涉及两个类: Salle和Ville。下面是Hibernate XML文件: Salle.hbm.xml & Ville.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated 2 f?vr. 2017 11:28:16 by Hibernate Tools 4.3.5.Final -->
<hibernate-mapping>
    <class name="metier.Salle" table="salle" catalog="aevbadherents" optimistic-lock="version">
        <id name="idSalle" type="int">
            <column name="idSALLE" />
            <generator class="assigned" />
        </id>
        <many-to-one name="ville" class="metier.Ville" fetch="select">
            <column name="idVilleSalle" />
        </many-to-one>
        <property name="adresse1" type="string">
            <column name="Adresse1" length="80" />
        </property>
        <property name="adresse2" type="string">
            <column name="Adresse2" length="80" />
        </property>
        <property name="description" type="string">
            <column name="Description" length="500" />
        </property>
        <set name="courses" table="cours" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="IdSalle" not-null="true" />
            </key>
            <one-to-many class="metier.Cours" />
        </set>
        <set name="passagegrades" table="passagegrade" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="IdSalle" />
            </key>
            <one-to-many class="metier.Passagegrade" />
        </set>
    </class>
</hibernate-mapping>

第二个文件：

<hibernate-mapping>
    <class name="metier.Ville" table="ville" catalog="aevbadherents" optimistic-lock="version">
        <id name="idVille" type="int">
            <column name="idVILLE" />
            <generator class="assigned" />
        </id>
        <many-to-one name="departement" class="metier.Departement" fetch="select">
            <column name="idDepartement" not-null="true" />
        </many-to-one>
        <property name="nom" type="string">
            <column name="Nom" length="60" not-null="true" />
        </property>
        <property name="codepostal" type="string">
            <column name="codepostal" length="6" not-null="true" />
        </property>
        <property name="gpslat" type="string">
            <column name="GPSLat" length="12" not-null="true" />
        </property>
        <property name="gpslon" type="string">
            <column name="GPSLon" length="12" not-null="true" />
        </property>
        <set name="adherentsForIdVilleResid" table="adherent" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="IdVilleResid" />
            </key>
            <one-to-many class="metier.Adherent" />
        </set>
        <set name="clubs" table="club" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="idville" not-null="true" />
            </key>
            <one-to-many class="metier.Club" />
        </set>
        <set name="salles" table="salle" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="idVilleSalle" />
            </key>
            <one-to-many class="metier.Salle" />
        </set>
        <set name="adherentsForIdVilleNais" table="adherent" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="IdVilleNais" />
            </key>
            <one-to-many class="metier.Adherent" />
        </set>
    </class>
</hibernate-mapping>

我读到这个异常可能是由JAR冲突引起的，但我没有找到任何东西。我不使用Maven (也许我应该使用?)，所以让我向您展示一下包含的JAR：

antlr-2.7.7.jar
commons-fileupload-1.3.jar
commons-io-2.0.1.jar
commons-lang3-3.1.jar
commons-logging-1.2-javadoc.jar
commons-logging-1.2.jar
dom4j-1.6.1.jar
freemarker-2.3.19.jar
hibernate-commons-annotations-4.0.5.Final.jar
hibernate-core-4.3.11.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-1.1.0.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.1.3.GA.jar
jboss-logging-annotations-1.2.0.Beta1.jar
jboss-transaction-api_1.2_spec-1.0.0.Final.jar
log4j-1.2.15.jar
mysql-connector-java-5.1.40-bin.jar
ognl-3.0.6.jar
struts2-core-2.3.15.3.jar
truc.txt
xwork-core-2.3.15.3.jar

请帮帮我，我被难住了.

Answer 1

这个问题的一个可能原因是您的类路径中有同一个类的多个版本。

我一直在java2s.com中查找，您列出的jar中似乎没有包含javassist.util.proxy.Proxy类的jar，因此我将使用以下命令使用jarscan尝试查找是否有其他jar包含该类：

jarscan -d PATH_TO_YOUR_CLASSPATH_DIR -j javassist.util.proxy.Proxy

您可以从此处https://java.net/projects/jarscan/downloads下载jarscan

如果您发现多个包包含相同的类，那么您就完成了。

Answer 2

马拉古纳

谢谢你的帮助。下面是jarscan的结果：

D:\temp\java\jarscan>jarscan -j javassist.util.proxy.Proxy
......................
+javassist-3.18.1-GA.jar
    javassist-3.18.1-GA.jar\javassist/util/proxy/Proxy.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$1.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$2.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$3.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$ClassLoaderProvide
r.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$Find2MethodsArgs.c
lass
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$ProxyDetails.class

    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory$UniqueName.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyFactory.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyObject.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyObjectInputStream.class
    javassist-3.18.1-GA.jar\javassist/util/proxy/ProxyObjectOutputStream.class
----------------------------------------------
Scanned archives: 22
Errors: 0
Archives with hits: 12

因此，这意味着没有其他jar包含该类。