[69] NullPointer exception in eco code java Sonar plugin

Author: rrousset-michelin

src/main/java/fr/greencodeinitiative/java/checks/FreeResourcesOfAutoCloseableInterface.java

@@ -73,6 +73,9 @@ public void visitNode(Tree tree) {
     @Override
     public void leaveNode(Tree tree) {
         if (tree.is(Tree.Kind.TRY_STATEMENT)) {
+            if(!withinTry.isEmpty()) {
+                withinTry.pop();
+            }
             List<Tree> secondaryTrees = toReport.pop();
             if (!secondaryTrees.isEmpty()) {
                 reportIssue(tree, MESSAGE_RULE);

src/test/files/FreeResourcesOfAutoCloseableInterface2.java

@@ -0,0 +1,45 @@
+package files;
+
+import java.io.FileWriter;
+import java.io.IOException;
+
+/*
+ * ecoCode - Java language - Provides rules to reduce the environmental footprint of your Java programs
+ * Copyright © 2023 Green Code Initiative (https://www.ecocode.io)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+public class FreeResourcesOfAutoCloseableInterface2 {
+
+    /**
+     * The first methods adds a "try" in the stack used to follow if the code is in a try
+     */
+    public void callingMethodWithTheTry() throws IOException {
+        try {
+            calledMethodWithoutTry();
+        } finally {
+            // Empty block of code
+        }
+    }
+
+    /**
+     * The "try" should have been poped from the stack before entering here
+     */
+    private void calledMethodWithoutTry() throws IOException {
+        FileWriter myWriter = new FileWriter("somefilepath");
+        myWriter.write("something");
+        myWriter.flush();
+        myWriter.close();
+    }
+}

src/test/java/fr/greencodeinitiative/java/checks/FreeResourcesOfAutoCloseableInterfaceTest.java

@@ -38,4 +38,11 @@ void test_no_java_version() {
                 .withCheck(new FreeResourcesOfAutoCloseableInterface())
                 .verifyIssues();
     }
+    @Test
+    void test_when_try_before_auto_closeable_but_different_hierarchy_of_code() {
+        CheckVerifier.newVerifier()
+                .onFile("src/test/files/FreeResourcesOfAutoCloseableInterface2.java")
+                .withCheck(new FreeResourcesOfAutoCloseableInterface())
+                .verifyNoIssues();
+    }
 }