title: MyBatis: ClassCastException: java.lang.Integer cannot be cast to java.lang.Boolean
body: <p>I'm getting this exception in MyBatis while trying to execute the update statement(UpdateUser):</p>
  
  <pre><code>java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Boolean
  at $Proxy6.updateUser(Unknown Source)
  at com.nortal.pirs.persistence.dbmybatis.UserDaoMyBatisImpl.updateUser(UserDaoMyBatisImpl.java:60)
  at com.nortal.pirs.test.persistence.UserDaoAbstractTest.testUpdateUser(UserDaoAbstractTest.java:117)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
  at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
  at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  </code></pre>
  
  <p>My Data type User with which I'm working looks like this:</p>
  
  <pre><code>public class User {
  private String firstName = "";
  private String lastName = "";
  private String personCode = "";
  private Date birthDate = new Date();
  private Gender gender = Gender.MALE;
  private String email = "";
  private String password = "";
  private UserState userState = UserState.UNAPPROVED;
  
  public User() {
  }
  </code></pre>
  
  <p>with the apropriate gettters and setters of course.</p>
  
  <p>My UserMapper.java interface for mybatis looks as follows:</p>
  
  <pre><code>public interface UserMapper {
  
  public User getUserByEmail(String email);   
  
  public void addUser(User user);
  
  public void removeUser(String email);
  
  public int getNumberOfUsers();
  
  public int userExists(String email);
  
  public boolean updateUser(@Param ("oldUser") User oldUser, @Param("newUser") User newUser);
  
  public Map&lt;String, User&gt; getAllUsers();
  </code></pre>
  
  <p>}</p>
  
  <p>And my UserMapper.xml looks like this:</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="UTF-8" ?&gt;
  &lt;!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd"&gt;
  &lt;mapper namespace="com.nortal.pirs.persistence.dbmybatis.UserMapper"&gt;
  
      &lt;!-- QUESTION: Is the &lt;cache /&gt; needed as described in one of your examples? And what is it meant to do? --&gt;
  
      &lt;resultMap id="UserMap" type="com.nortal.pirs.datamodel.User"&gt;
          &lt;result property="firstName" column="firstName"/&gt;
          &lt;result property="lastName" column="lastName"/&gt;
          &lt;result property="personCode" column="personCode"/&gt;
          &lt;result property="birthDate" column="birthDate" javaType="Date"/&gt;
          &lt;result property="gender" column="gender" javaType="com.nortal.pirs.datamodel.Gender"/&gt;
          &lt;result property="email" column="email"/&gt;
          &lt;result property="password" column="password"/&gt;
          &lt;result property="userState" column="userState" javaType="com.nortal.pirs.datamodel.UserState"/&gt;        
      &lt;/resultMap&gt;
  
      &lt;select id="getUserByEmail" parameterType="String" resultMap="UserMap"&gt;
          SELECT 
          firstName,
          lastName,
          personCode,
          birthDate,
          gender,
          email,
          password,
          userState       
          FROM   USER 
          WHERE  email = #{email}
      &lt;/select&gt;
  
      &lt;insert id="addUser" parameterType="User" &gt;
          INSERT INTO user
  
          (firstName,
          lastName,
          personCode,
          birthDate,
          gender,
          email,
          password,
          userState)
  
          VALUES
          (#{firstName},
          #{lastName},
          #{personCode},
          #{birthDate},
          #{gender},
          #{email},
          #{password},
          #{userState})        
      &lt;/insert&gt;
  
      &lt;delete id="removeUser" parameterType="String"&gt;
          DELETE FROM user
          WHERE email = #{email}
      &lt;/delete&gt;
  
  
      &lt;select id="getNumberOfUsers" resultType="int"&gt;
          SELECT
          COUNT(email)
          FROM USER
      &lt;/select&gt;
  
      &lt;select id="userExists" parameterType="String" resultType="int"&gt;
          SELECT CASE WHEN EXISTS (
              SELECT
              COUNT(email)
              FROM USER)
      &lt;/select&gt;
  
      &lt;update id="updateUser" parameterType="map"&gt;
          UPDATE user
          SET 
          firstName = #{newUser.firstName},
          lastName = #{newUser.lastName},
          personCode = #{newUser.personCode},
          birthDate = #{newUser.birthDate},
          gender = #{newUser.gender},
          email = #{newUser.email},
          password = #{newUser.password},
          userState = #{newUser.userState}
          WHERE email = #{oldUser.email}
      &lt;/update&gt;
  
  &lt;/mapper&gt;
  </code></pre>
  
  <p>as I've mentioned the exception is thrown when updateUser is called. The strange thing is I can't even see anything Integer related here. I mean I even tried testing with just updating one field. It's all the same. I don't get the exception only if the query is totally removed, I would get the query error or something error...</p>
  
  <p>Any suggestions? Thanks in advance.</p>
  
  <p>Edit: if people are voting my question down without saying anything, they should at least tell what was wrong with the question, that would be more helpful... I haven't posted this question out of fun. Indeed I'm kinda stuck on this for some time now...</p>