java.lang.ClassCastException: java.lang.String cannot be cast to [C

Question

I'm using the following code to convert char[] to string, but it is throwing:

java.lang.ClassCastException: java.lang.String cannot be cast to [C

char[] charArray = user.getUserPassword();  
String userPassword = String.valueOf(charArray);

Here user.getUserPassword() returns char[]. I also tried the following:

String userPassword = new String(charArray);

But it also throws the same exception. (I'm using java 8.)

The complete stack trace;

java.lang.ClassCastException: java.lang.String cannot be cast to [C
at org.hibernate.type.descriptor.java.PrimitiveCharacterArrayTypeDescriptor.unwrap(PrimitiveCharacterArrayTypeDescriptor.java:40)
at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:64)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:90)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:286)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:281)
at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:616)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1901)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)
at org.hibernate.loader.Loader.doQuery(Loader.java:910)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
at org.hibernate.loader.Loader.doList(Loader.java:2554)
at org.hibernate.loader.Loader.doList(Loader.java:2540)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)
at org.hibernate.loader.Loader.list(Loader.java:2365)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1264)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
at com.humworld.ccs.daoimpl.UserDAOImpl.login(UserDAOImpl.java:29)
at com.humworld.ccs.serviceimpl.UserServiceImpl.login(UserServiceImpl.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy37.login(Unknown Source)
at com.humworld.ccs.controller.LoginController.loginAuthentication(LoginController.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:871)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:845)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

This is the UserDAOImpl class;

@Repository("userDAO")
public class UserDAOImpl implements UserDAO{

@Autowired
private SessionFactory sessionFactory;

@SuppressWarnings("unchecked")
@Override
public List<Object[]> login(String UserName, String UserPassword) {

    Session session = sessionFactory.openSession();
    String hql = HqlConstant.UserQuery;
    Query query = session.createQuery(hql);
    query.setParameter("UserName", UserName);
    query.setParameter("UserPassword", UserPassword);
    List<Object[]> list = query.list();

    session.close();
    return list;
}
}

This is the HQL query;

from UserModel um inner join um.userRoleModel where um.UserName = :UserName and um.UserPassword = :UserPassword

if user.getUserPassword() would return a String the Exception would make sense - please post code from User with that method — Jan
– Jan, Commented Apr 26, 2016 at 11:25
I would check the signature of user.getUserPassword() one more time if I were you. — NilsH
– NilsH, Commented Apr 26, 2016 at 11:25
also: Line numbers (Exception / Code) might make sense to track this down — Jan
– Jan, Commented Apr 26, 2016 at 11:25
Please provide the complete stack trace for a fast and correct answer. — Kamidu Punchihewa
– Kamidu Punchihewa, Commented Apr 26, 2016 at 11:33

Jan · Accepted Answer · 2016-04-26 12:11:35Z

4

My theory on what happens:

You put a String into

 query.setParameter("UserPassword", UserPassword);

BUT

As you said, your userPassword property for your user Object is of type char[]

Now hibernate is a quite clever tool - it would recognize that object type for userPassword is char[] and then tries to set that into the generated query. But you passed a String.

Try this for once:

   query.setParameter("UserPassword", UserPassword.toCharArray());

in your login method.

answered Apr 26, 2016 at 12:11

Jan

13.9k3 gold badges35 silver badges58 bronze badges

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Petrov Dmitrii · Accepted Answer · 2016-04-26 11:26:37Z

0

Try use String userPassword = new StringBuilder() .append(user.getUserPassword()).toString();

answered Apr 26, 2016 at 11:26

Petrov Dmitrii

2281 silver badge10 bronze badges

This also throws the same exception.

karthi
– karthi

04/26/2016 11:42:53
Commented Apr 26, 2016 at 11:42
it wont solve problem as problem is related to casting from String to char[] not other way around

user902383
– user902383

04/26/2016 11:47:41
Commented Apr 26, 2016 at 11:47

Add a comment |

V_Dev · Accepted Answer · 2016-04-26 12:08:28Z

0

Try this:

String result=String.copyValueOf(charArray);

edited Apr 26, 2016 at 12:08

answered Apr 26, 2016 at 11:57

V_Dev

936 bronze badges

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review

madhead
– madhead

04/26/2016 14:12:35
Commented Apr 26, 2016 at 14:12
@madhead: how is this not an answer? It tries to directly address the error the OP reports. Voting to keep this answer.

gariepy
– gariepy

04/26/2016 15:42:19
Commented Apr 26, 2016 at 15:42

Add a comment |

Rao · Accepted Answer · 2016-10-16 05:04:12Z

0

If you want to cast a String to a char (array, I'm guessing). I used a for loop.

for (int i = 0; i < length; i++) {
  char[i] Letter = message1.charAt(i);
}

This was derived from my older code, but this should still convert the string message1 to a char Array... Tell me if this would help :P

edited Oct 16, 2016 at 5:04

Rao

21.4k12 gold badges62 silver badges80 bronze badges

answered Apr 26, 2016 at 12:10

Kaelinator

4705 silver badges17 bronze badges

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Dada · Accepted Answer · 2022-05-19 07:50:17Z

-1

I was facing the similar issue:

java.lang.ClassCastException: java.lang.String cannot be cast to [C

in the line

commons.validateException(String.valueOf(response.getBody().path("code")),
    String.valueOf(response.getBody().path("message"))

Adding .toString() resolved the issue. Below is the line of code.

commons.validateException(String.valueOf(response.getBody().path("code").toString()), 
    String.valueOf(response.getBody().path("message").toString())

edited May 19, 2022 at 7:50

Dada

6,7457 gold badges28 silver badges48 bronze badges

answered May 18, 2022 at 18:32

pallavi manjunath

1

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