'hashCode()' called on array warnings fixed

platform/platform-tests/testSrc/com/intellij/history/core/storage/TestContent.java

@@ -43,11 +43,12 @@ public class TestContent extends Content {
 
   @Override
   public boolean equals(Object o) {
+    if (!(o instanceof Content)) return false;
     return Arrays.equals(myData, ((Content)o).getBytes());
   }
 
   @Override
   public int hashCode() {
-    return myData.hashCode();
+    return Arrays.hashCode(myData);
   }
 }

plugins/maven/src/main/java/org/jetbrains/idea/maven/vfs/MavenPropertiesVirtualFile.java

@@ -24,6 +24,7 @@ import org.jetbrains.annotations.NotNull;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.Arrays;
 import java.util.Properties;
 import java.util.Set;
 import java.util.TreeSet;
@@ -109,7 +110,7 @@ public class MavenPropertiesVirtualFile extends VirtualFile {
 
   @Override
   public long getModificationStamp() {
-    return myContent.hashCode();
+    return Arrays.hashCode(myContent);
   }
 
   @Override