diff --git a/eclipse.platform.releng/bundles/org.eclipse.test.performance/.settings/org.eclipse.jdt.core.prefs b/eclipse.platform.releng/bundles/org.eclipse.test.performance/.settings/org.eclipse.jdt.core.prefs
index 379564200ae..bdb89d64c20 100644
--- a/eclipse.platform.releng/bundles/org.eclipse.test.performance/.settings/org.eclipse.jdt.core.prefs
+++ b/eclipse.platform.releng/bundles/org.eclipse.test.performance/.settings/org.eclipse.jdt.core.prefs
@@ -32,7 +32,7 @@ org.eclipse.jdt.core.compiler.problem.APILeak=warning
 org.eclipse.jdt.core.compiler.problem.annotatedTypeArgumentToUnannotated=info
 org.eclipse.jdt.core.compiler.problem.annotationSuperInterface=warning
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
-org.eclipse.jdt.core.compiler.problem.autoboxing=info
+org.eclipse.jdt.core.compiler.problem.autoboxing=ignore
 org.eclipse.jdt.core.compiler.problem.comparingIdentical=warning
 org.eclipse.jdt.core.compiler.problem.deadCode=warning
 org.eclipse.jdt.core.compiler.problem.deprecation=warning
diff --git a/eclipse.platform.releng/bundles/org.eclipse.test.performance/src/org/eclipse/test/internal/AwtScreenshot.java b/eclipse.platform.releng/bundles/org.eclipse.test.performance/src/org/eclipse/test/internal/AwtScreenshot.java
index ee7906dc126..b9c4628465b 100644
--- a/eclipse.platform.releng/bundles/org.eclipse.test.performance/src/org/eclipse/test/internal/AwtScreenshot.java
+++ b/eclipse.platform.releng/bundles/org.eclipse.test.performance/src/org/eclipse/test/internal/AwtScreenshot.java
@@ -93,8 +93,15 @@ public static void dumpAwtScreenshot(String screenshotFile) {
                 processBuilder.environment().put("AWT_TOOLKIT", "CToolkit");
             }
             Process process = processBuilder.start();
-            new StreamForwarder(process.getErrorStream(), System.out).start();
-            new StreamForwarder(process.getInputStream(), System.out).start();
+
+            @SuppressWarnings("resource") // never close process streams
+            InputStream errorStream = process.getErrorStream();
+
+            @SuppressWarnings("resource") // never close process streams
+            InputStream inputStream = process.getInputStream();
+
+            new StreamForwarder(errorStream, System.out).start();
+            new StreamForwarder(inputStream, System.out).start();
             long end = System.currentTimeMillis() + TIMEOUT_SECONDS * 1000;
             boolean done = false;
             do {
diff --git a/eclipse.platform.releng/bundles/org.eclipse.test/src/org/eclipse/test/AbstractJUnitResultFormatter.java b/eclipse.platform.releng/bundles/org.eclipse.test/src/org/eclipse/test/AbstractJUnitResultFormatter.java
index de8c659c80c..4aa78b8773a 100644
--- a/eclipse.platform.releng/bundles/org.eclipse.test/src/org/eclipse/test/AbstractJUnitResultFormatter.java
+++ b/eclipse.platform.releng/bundles/org.eclipse.test/src/org/eclipse/test/AbstractJUnitResultFormatter.java
@@ -129,8 +129,9 @@ Reader getSysErrReader() throws IOException {
 	 * @throws IOException If any I/O problem occurs during writing the data
 	 */
 	void writeSysOut(Writer writer) throws IOException {
-		Objects.requireNonNull(writer, "Writer cannot be null");
-		writeFrom(this.sysOutStore, writer);
+		@SuppressWarnings("resource") // requireNonNull just returns first argument
+		Writer w = Objects.requireNonNull(writer, "Writer cannot be null");
+		writeFrom(this.sysOutStore, w);
 	}
 
 	/**
@@ -141,8 +142,9 @@ void writeSysOut(Writer writer) throws IOException {
 	 * @throws IOException If any I/O problem occurs during writing the data
 	 */
 	void writeSysErr(Writer writer) throws IOException {
-		Objects.requireNonNull(writer, "Writer cannot be null");
-		writeFrom(this.sysErrStore, writer);
+		@SuppressWarnings("resource") // requireNonNull just returns first argument
+		Writer w = Objects.requireNonNull(writer, "Writer cannot be null");
+		writeFrom(this.sysErrStore, w);
 	}
 
 	static Optional<TestIdentifier> traverseAndFindTestClass(TestPlan testPlan, TestIdentifier testIdentifier) {