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POWhy does Hibernate throw a ClassCastException when calling session.save(object)?
 

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  1. POWhy does Hibernate throw a ClassCastException when calling session.save(object)?
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    <p>When I do the following Hibernate call I get a ClassCastException (see Stacktrace) but I have problems to understand why. What's Hibernate trying to do here? Is it trying to cast one of my objects to a different class type? If yes, why and to what class?</p> <pre><code>session.save(fooAccount); </code></pre> <p><strong>Stacktrace:</strong></p> <pre><code>com.foo.web.model.exception.FailedDatabaseOperationException: java.lang.ClassCastException: com.foo.web.model.authentication.SecurePassword at com.foo.web.controller.db.HibernateController.savefooAccount(HibernateController.java:883) at com.foo.web.model.account.fooAccount.save(fooAccount.java:459) at com.foo.web.controller.AccountController.createfooAccount(AccountController.java:258) at com.foo.web.view.start.RegisterController.register(RegisterController.java:233) at com.foo.web.view.start.RegisterController.onClick$btn_register(RegisterController.java:196) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.zkoss.zk.ui.event.GenericEventListener.onEvent(GenericEventListener.java:81) at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:192) at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138) at org.zkoss.zk.ui.impl.EventProcessingThreadImpl.process0(EventProcessingThreadImpl.java:517) at org.zkoss.zk.ui.impl.EventProcessingThreadImpl.sendEvent(EventProcessingThreadImpl.java:121) at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:319) at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:329) at org.zkoss.zk.ui.AbstractComponent$ForwardListener.onEvent(AbstractComponent.java:3034) at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:192) at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138) at org.zkoss.zk.ui.impl.EventProcessingThreadImpl.process0(EventProcessingThreadImpl.java:517) at org.zkoss.zk.ui.impl.EventProcessingThreadImpl.run(EventProcessingThreadImpl.java:444) Caused by: java.lang.ClassCastException: com.foo.web.model.authentication.SecurePassword at org.hibernate.type.ComponentType.toLoggableString(ComponentType.java:410) at org.hibernate.type.ComponentType.toLoggableString(ComponentType.java:414) at org.hibernate.pretty.Printer.toString(Printer.java:76) at org.hibernate.pretty.Printer.toString(Printer.java:113) at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:120) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133) at com.foo.web.controller.db.HibernateController.savefooAccount(HibernateController.java:879) </code></pre> <hr> <p><strong>Edit:</strong> Here are the mappings as well as the code that stores the object:</p> <p><strong>Mapping file</strong> (shortened version. Irrelevant stuff omitted):</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"&gt; &lt;!-- Generated 26.04.2011 14:49:15 by Hibernate Tools 3.3.0.GA --&gt; &lt;hibernate-mapping&gt; &lt;class name="com.foo.web.model.account.fooAccount" table="fooACCOUNT"&gt; &lt;id name="id" type="long" access="field"&gt; &lt;column name="foo_ACCOUNT_ID" /&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;many-to-one name="defaultMailAccount" lazy="false" column="DEFAULT_MAIL_ACCOUNT_ID" /&gt; &lt;bag name="mailAccounts" table="MAILACCOUNTS" lazy="false" inverse="true"&gt; &lt;key column="foo_ACCOUNT_ID"&gt;&lt;/key&gt; &lt;one-to-many class="com.foo.web.model.mail.account.MailAccount" /&gt; &lt;/bag&gt; &lt;component name="user" class="com.foo.web.model.account.fooUser"&gt; &lt;component name="activationCode"&gt; &lt;property name="activationCode" column="ACTIVATION_CODE"&gt;&lt;/property&gt; &lt;/component&gt; &lt;component name="password" class="com.foo.web.model.authentication.MediumSecurePassword"&gt; &lt;property name="hash" column="PASSWORD" /&gt; &lt;/component&gt; &lt;component name="resetCode"&gt; &lt;property name="resetCode" column="RESET_CODE" /&gt; &lt;/component&gt; &lt;one-to-one name="fooAccount" class="com.foo.web.model.account.fooAccount"&gt;&lt;/one-to-one&gt; &lt;component name="username"&gt; &lt;property name="username" column="USERNAME" unique="true" /&gt; &lt;/component&gt; &lt;property name="userStatus"&gt; &lt;column name="USERSTATUS" /&gt; &lt;type name="org.hibernate.type.EnumType"&gt; &lt;param name="type"&gt;12&lt;/param&gt; &lt;param name="enumClass"&gt;com.foo.web.model.account.UserStatus&lt;/param&gt; &lt;/type&gt; &lt;/property&gt; &lt;property name="userType"&gt; &lt;column name="USERTYPE" /&gt; &lt;type name="org.hibernate.type.EnumType"&gt; &lt;param name="type"&gt;12&lt;/param&gt; &lt;param name="enumClass"&gt;com.foo.web.model.account.UserType&lt;/param&gt; &lt;/type&gt; &lt;/property&gt; &lt;/component&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p><strong>SecurePassword.java</strong> (shortened)</p> <pre><code>/** * Represents a password. */ public class SecurePassword extends Password { /** * Default constructor */ public SecurePassword() { super(); } /** * Constructor method. Will throw IllegalPasswordException if password is * not safe. */ public SecurePassword(String password) throws IllegalPasswordException { setPassword(password); } /** * Checks if the given character is a number * * @param c * The character to check * @return Returns true if the given character is a number */ public boolean isNumber(char c) { // ... } /** * Checks is a given password is valid. */ public boolean passwordValid(Password password) throws IllegalPasswordException { return passwordValid(password.toString()); } /** * Checks is a given password is valid. */ public boolean passwordValid(String password) throws IllegalPasswordException { // ... } /** * Sets a new password. */ @Override public void setPassword(String password) throws IllegalPasswordException { if (passwordValid(password)) { this.password = password; } } } </code></pre> <p><strong>Password.java</strong> (shortened)</p> <pre><code>/** * Represents a simple password without much restriction */ public class Password { Crypter crypter = new Crypter(); String hash = null; String password = null; public Password() { super(); } public Password(String password) throws IllegalPasswordException { setPassword(password); } @Override public boolean equals(Object password) { if (this == password) { return true; } if (password instanceof Password) { Password p = (Password) password; return getHash().equals(p.getHash()); } if (password instanceof String) { String password_str = getPassword(); if (password_str != null) { return password_str.equals(password); } } return false; } /** * Returns the hashed version of this password * * @return The hashed version of this password */ public String getHash() { if (hash == null) { try { hash = crypter.hash(getPassword()); } catch (FailedCryptOperationException e) { handleException(e, false, null, null); } } return hash; } public String getPassword() { return password; } /* * Handles the given exception */ private void handleException(Exception e, boolean notifyUser, String customTitle, String customErrorMessage) { SystemController.handleException(e, notifyUser, customTitle, customErrorMessage); } public void setHash(String hash) { this.hash = hash; } @SuppressWarnings("unused") public void setPassword(String password) throws IllegalPasswordException { hash = null; this.password = password; } @Override public String toString() { return getPassword(); } } </code></pre> <p><strong>MediumSecurePassword.java</strong></p> <pre><code>public class MediumSecurePassword extends SecurePassword { public final int MAX_LENGTH = 64; public final int MIN_LENGTH = 6; StringUtil stringUtil = new StringUtil(); public MediumSecurePassword() { super(); } /** * Constructor method. Will throw IllegalPasswordException if password is * not safe. Medium Safe passwords are at least 6 characters long. */ public MediumSecurePassword(String password) throws IllegalPasswordException { setPassword(password); } /** * Checks if the given character is a number */ public boolean isNumber(char c) { // ... } /** * Checks is a given password is valid. Valid means that it's secure (at * least 8 characters, at least 1 number, at least 1 special character). */ public boolean passwordValid(Password password) throws IllegalPasswordException { return passwordValid(password.toString()); } /** * Checks is a given password is valid. Valid means that it's "medium secure" (min. * length of 6). */ public boolean passwordValid(String password) throws IllegalPasswordException { // ... } /** * Sets a new password. Will throw IllegalPasswordException if password is * not safe. Safe passwords are at least 8 characters long, consist of * numbers, letters and special characters. */ @Override public void setPassword(String password) throws IllegalPasswordException { if (passwordValid(password)) { this.password = password; } } } </code></pre> <hr> <p><strong>Note:</strong> If I remove these 3 lines from my mapping file everything runs smoothly:</p> <pre><code>&lt;component name="password" class="com.foo.web.model.authentication.MediumSecurePassword"&gt; &lt;property name="hash" column="PASSWORD" /&gt; &lt;/component&gt; </code></pre> <p>So, for me there seems to be a problem with getting the password's hash value via <code>passwordInstance.getHash()</code>? Not sure though.</p>
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      1. POWhy does Hibernate throw a ClassCastException when calling session.save(object)?
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    2. VO
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    1. COWhat's the relation between _assumably_ `Account` entity and `SecurePassword`? What are the mappings?
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      1. POWhy does Hibernate throw a ClassCastException when calling session.save(object)?
      1. USnobeh
    2. COpost a [SSCCE](http://sscce.org/) or we won't be able to understand it either
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      1. USAlonso Dominguez
    3. CO@nobeh I added the mapping file and source code
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      1. USTimo
 

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