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LDAP Authentication

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I worked on LDAP authentication , and i used the following code, but i'm getting the error, i.e
javax.naming.AuthenticationException: [LDAP: error code 49 - Invalid Credentials] .
Pls solve this problem and provide the solution.
code is
String url="ldap://,ou=company name,o=organization name";
Hashtable environment =new Hashtable();
environment.put(Context.SECURITY_AUTHENTICATION, "simple");
environment.put(Context.SECURITY_PRINCIPAL,"CN=" + username);
DirContext dircontext=new InitialDirContext(environment);
Attributes attributes=dircontext.getAttributes("CN=" + username);
String fullname=(String) attributes.get("givenname").get();
} catch(AuthenticationException ex) {out.println(ex);}
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What is the principal you are passing? It has to be the dn without the prefix "dn="
But I have seen this error only when the password is wrong. What's the LDAP server you are using? Also check passing an empty string for password.
Consider Paul's rocket mass heater.
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