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Java.lang.classcastexception Java.util.arraylist Cannot Be Cast To Java.util.hashmap

share|improve this answer edited Mar 20 '13 at 11:54 answered Mar 20 '13 at 11:46 Abimaran Kugathasan 17.2k54275 add a comment| up vote 1 down vote Well it's because your values Anyone got any ideas? :\ import java.util.ArrayList; import java.util.HashMap; public class fakefile { int age; String fname; HashMap files = new HashMap(); fakefile[] filearr; public fakefile(int age, String fname) What is Referential Integrity in Database or SQL -... It can be best explained with an example. weblink

processDoFilter(InvokerFilterChain.java:203) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. Thanks Show Jonas Yuan added a comment - 27/Sep/11 4:06 PM Michael, this issue got fixed (tested at revision 89768). java:533) at com.liferay.portal.servlet.MainServlet.service(MainServlet.java:510) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:210) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. doFilter(InvokerFilterChain.java:92) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. http://stackoverflow.com/questions/15522546/why-hashmap-values-are-not-cast-in-list

Thanks Hide Permalink Michael Han added a comment - 29/Sep/11 10:26 AM Already resolved Show Michael Han added a comment - 29/Sep/11 10:26 AM Already resolved Hide Permalink jiyun kang (Inactive) How to compare Arrays in Java - Equals vs deepEqua... processDoFilter(InvokerFilterChain.java:203) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. So not able to cast to List.

You can get rid of this error by treating it like what it is: a list. A carefully designed program will never see ClassCastException. doFilter(InvokerFilterChain.java:92) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. Read the API: http://docs.oracle.com/javase/6/docs/api/java/util/HashMap.html You should implement your own Comparator as a solution, I guess.

hooknc 2008-07-07 20:50:55 UTC #4 Do you have to use a HashSet? Can a method which argument is a super type accepts sub type? Anyway, I'll not discuss it. http://stackoverflow.com/questions/31832337/java-lang-classcastexception-java-util-hashmapentryset-cannot-be-cast-to-java ClassCastException are simple like NullPointerException just look the stack-trace and go to the line number.

posted 1 year ago You cannot automatically convert an object from one type to a totally different type by casting - that is not what casting is for. share|improve this answer answered Mar 20 '13 at 11:45 Andrew Logvinov 10.3k12534 add a comment| up vote 3 down vote If you have already created an instance of your List subtype You cannot sort it using natural ordering.. Could this problem be related to https://jira.terracotta.org/jira/browse/CDV-1444?

Should I report it? https://coderanch.com/t/649108/java/Casting-Array-List-hashmap I end up getting the following error: Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lfakefile; at fakefile.(fakefile.java:24) at FakeMake.main(FakeMake.java:81) I have tried to cast the entire collection into why would you expect that to work? (And do you control the API? Where to take phone interview while at work Space of real sequences with finitely many nonzero elements is a Banach space?

Hope this makes everything clear, Chris Chris Dennis (Terracotta Engineer) Forum Index -> Terracotta Platform Go to: Select a forum BigMemory Ehcache General Quartz BigMemory + Hadoop Terracotta for have a peek at these guys here is the unexpected exception thrown ": java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Double" November 5, 2015 at 7:24 AM Manjula said... [Ljava.lang.String; cannot be cast to java.util.Collection August 21, 2016 doFilter(InvokerFilterChain.java:72) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter .java:121) at com.liferay.portal.servlet.filters.strip.StripFilter.processFilter(St ripFilter.java:304) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java :48) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. Formula 1 rebus Can a text in Latin be understood by an educated Italian who never had any formal teaching of that language?

processDirectCallFilter(InvokerFilterChain.java:184) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. I have confirmed this in HEAD revision of trunk. In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms http://pgexch.com/java-lang-classcastexception-java-util-arraylist/java-lang-classcastexception-java-util-arraylist-cannot-be-cast-to-java-util-set.html Because your HashMap does not implement Comparable interface..

Then I am trying to cast this object array to a fakefile array. processDoFilter(InvokerFilterChain.java:203) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. It's also a good idea to refresh your knowledge on type-casting in Java.

Why is looping over find's output bad practice?

In Revelation 19:16, of which kings is Jesus king? doFilter(InvokerFilterChain.java:105) at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter .java:121) at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter( SecureFilter.java:201) at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java :48) at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain. How to Split String in SQL Server and Sybase How to get current date, month, year and day of we... Not the answer you're looking for?

Regards, Isaac Tim Cooke Sheriff Posts: 3188 142 I like... In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms http://docs.oracle.com/javase/6/docs/api/java/util/HashMap.html#values%28%29 This works: List valuesToMatch = new ArrayList( highLowValueMap.values() ); Because ArrayList has a constructor that accepts a collection. http://pgexch.com/java-lang-classcastexception-java-util-arraylist/java-lang-classcastexception-java-util-arraylist-cannot-be-cast-to-java-util-map.html Can a president win the electoral college and lose the popular vote Are there still systems around with a /bin/sh binary?

HashSet blah = (HashSet)graph.getVertices(); for (Vertex v : blah) { System.out.println(v); } i get the following error java.lang.ClassCastException: java.util.HashMap$KeySet cannot be cast to java.util.HashSet Any ideas on how to solve this Now you know where exactly ClassCastException is coming and stack trace also told which object it was trying to cast, Now you have to find, how that type of object comes No public Collection values() { Collection vs = values; return (vs != null ? asked 1 year ago viewed 2710 times active 1 year ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Visit Chat Related 2java.lang.ClassCastException: java.util.HashMap cannot be cast to java.lang.Comparable0java.lang.String cannot

What did you expect to happen?