[java] Avoid some warnings

std/java/_std/EReg.hx

@@ -45,7 +45,7 @@ import java.util.regex.*;
 			}
 		}
 
-		matcher = Pattern._compile(convert(r), flags).matcher("");
+		matcher = Pattern.compile(convert(r), flags).matcher("");
 		pattern = r;
 	}
 

std/sys/db/Manager.hx

@@ -651,6 +651,7 @@ class Manager<T : Object> {
 			Reflect.setField(x,key,null);
 		else
 			Reflect.setField(x,key,Reflect.field(v,table_keys[0]));
+		return v;
 	}
 
 	#end

tests/unit/src/unit/TestJava.hx

@@ -178,10 +178,10 @@ class TestJava extends Test
 
 	function testNameClash()
 	{
-		eq(Base._nameClash(null), -1);
+		eq(Base.nameClash(null), -1);
 		eq(new Base().nameClash(), 1);
 		eq(new Base().varNameClash(1), 1);
-		eq(Base._varNameClash(10.4), 10.4);
+		eq(Base.varNameClash(10.4), 10.4);
 
 	}