Remove unused imports, stray semicolon, use static access to a static method

h2/src/main/org/h2/api/UserToRolesMapper.java

@@ -6,7 +6,6 @@
 package org.h2.api;
 
 import java.util.Collection;
-import java.util.Set;
 
 import org.h2.security.auth.AuthenticationException;
 import org.h2.security.auth.AuthenticationInfo;

h2/src/main/org/h2/engine/Database.java

@@ -2989,7 +2989,7 @@ public class Database implements DataHandler {
     public void setAuthenticator(Authenticator authenticator) {
         if (authenticator!=null) {
             authenticator.init(this);
-        };
+        }
         this.authenticator=authenticator;
     }
 }

h2/src/main/org/h2/jdbc/JdbcConnection.java

@@ -40,11 +40,10 @@ import org.h2.command.CommandInterface;
 import org.h2.engine.ConnectionInfo;
 import org.h2.engine.Constants;
 import org.h2.engine.Mode;
+import org.h2.engine.Mode.ModeEnum;
 import org.h2.engine.SessionInterface;
 import org.h2.engine.SessionRemote;
 import org.h2.engine.SysProperties;
-import org.h2.engine.Mode.ModeEnum;
-import org.h2.engine.Session;
 import org.h2.message.DbException;
 import org.h2.message.TraceObject;
 import org.h2.result.ResultInterface;

h2/src/main/org/h2/security/auth/impl/StaticUserCredentialsValidator.java

@@ -57,7 +57,7 @@ public class StaticUserCredentialsValidator implements CredentialsValidator {
     public void configure(ConfigProperties configProperties) {
         String userNamePatternString=configProperties.getStringValue("userNamePattern",null);
         if (userNamePatternString!=null) {
-            userNamePattern=userNamePattern.compile(userNamePatternString);
+            userNamePattern = Pattern.compile(userNamePatternString);
         }
         password=configProperties.getStringValue("password",password);
         String saltString =configProperties.getStringValue("salt",null);