diff --git a/src/java.compiler/share/classes/javax/tools/ForwardingJavaFileManager.java b/src/java.compiler/share/classes/javax/tools/ForwardingJavaFileManager.java
index 1cff1c35770..a323025ab58 100644
--- a/src/java.compiler/share/classes/javax/tools/ForwardingJavaFileManager.java
+++ b/src/java.compiler/share/classes/javax/tools/ForwardingJavaFileManager.java
@@ -52,11 +52,34 @@ public class ForwardingJavaFileManager<M extends JavaFileManager> implements Jav
     protected final M fileManager;
 
     /**
-     * Creates a new instance of {@code ForwardingJavaFileManager}.
+     * Whether the delegate is owned by this instance and should be closed when
+     * this instance is closed.
+     */
+    private final boolean shouldClose;
+
+    /**
+     * Creates a new instance of {@code ForwardingJavaFileManager} which takes
+     * ownership of the given delegate, and will close it when this instance is
+     * closed.
+     *
      * @param fileManager delegate to this file manager
      */
     protected ForwardingJavaFileManager(M fileManager) {
+        this(fileManager, true);
+    }
+
+    /**
+     * Creates a new instance of {@code ForwardingJavaFileManager}.
+     *
+     * @param fileManager delegate to this file manager
+     * @param shouldClose whether the delegate should be closed when this
+     *     instance is closed.
+     *
+     * @since 26
+     */
+    protected ForwardingJavaFileManager(M fileManager, boolean shouldClose) {
         this.fileManager = Objects.requireNonNull(fileManager);
+        this.shouldClose = shouldClose;
     }
 
     /**
@@ -247,7 +270,9 @@ public void flush() throws IOException {
 
     @Override
     public void close() throws IOException {
-        fileManager.close();
+        if (shouldClose) {
+            fileManager.close();
+        }
     }
 
     /**
diff --git a/test/langtools/tools/javac/classfiles/InnerClasses/T8068517.java b/test/langtools/tools/javac/classfiles/InnerClasses/T8068517.java
index edb760757f6..52f43856220 100644
--- a/test/langtools/tools/javac/classfiles/InnerClasses/T8068517.java
+++ b/test/langtools/tools/javac/classfiles/InnerClasses/T8068517.java
@@ -107,17 +107,18 @@ void run() throws Exception {
     void runTest(String aJava, String bJava) throws Exception {
         try (JavaFileManager fm = ToolProvider.getSystemJavaCompiler().getStandardFileManager(null, null, null)) {
             ToolBox tb = new ToolBox();
-            ToolBox.MemoryFileManager memoryFM1 = new ToolBox.MemoryFileManager(fm);
-            new JavacTask(tb).fileManager(memoryFM1)
-                              .sources(aJava, bJava)
-                              .run();
-            ToolBox.MemoryFileManager memoryFM2 = new ToolBox.MemoryFileManager(fm);
-            new JavacTask(tb).fileManager(memoryFM2)
-                              .sources(bJava, aJava)
-                              .run();
+            try (var memoryFM1 = new ToolBox.MemoryFileManager(fm, false);
+                 var memoryFM2 = new ToolBox.MemoryFileManager(fm, false)) {
+                new JavacTask(tb).fileManager(memoryFM1)
+                        .sources(aJava, bJava)
+                        .run();
+                new JavacTask(tb).fileManager(memoryFM2)
+                        .sources(bJava, aJava)
+                        .run();
 
-            Assert.check(Arrays.equals(memoryFM1.getFileBytes(StandardLocation.CLASS_OUTPUT, "B"),
-                                       memoryFM2.getFileBytes(StandardLocation.CLASS_OUTPUT, "B")));
+                Assert.check(Arrays.equals(memoryFM1.getFileBytes(StandardLocation.CLASS_OUTPUT, "B"),
+                        memoryFM2.getFileBytes(StandardLocation.CLASS_OUTPUT, "B")));
+            }
         }
     }
 }
diff --git a/test/langtools/tools/javac/processing/filer/TestOriginatingElements.java b/test/langtools/tools/javac/processing/filer/TestOriginatingElements.java
index a936c0bb554..82602bd464f 100644
--- a/test/langtools/tools/javac/processing/filer/TestOriginatingElements.java
+++ b/test/langtools/tools/javac/processing/filer/TestOriginatingElements.java
@@ -67,7 +67,6 @@
 import javax.tools.StandardLocation;
 import toolbox.JavacTask;
 import toolbox.TestRunner;
-import toolbox.TestRunner.Test;
 import toolbox.ToolBox;
 import toolbox.ToolBox.MemoryFileManager;
 
@@ -174,7 +173,7 @@ private String getInfo(FileObject fo) {
             };
             try {
                 String generatedData;
-                try (MemoryFileManager mfm = new MemoryFileManager(sjfm)) {
+                try (MemoryFileManager mfm = new MemoryFileManager(sjfm, /* shouldClose */ false)) {
                     compiler.getTask(null, mfm, null, null, null,
                                      List.of(new ToolBox.JavaSource("package test; public class Generated2 {}")))
                             .call();
diff --git a/test/langtools/tools/lib/toolbox/ToolBox.java b/test/langtools/tools/lib/toolbox/ToolBox.java
index ee217ab2c0c..c30dac5d2c5 100644
--- a/test/langtools/tools/lib/toolbox/ToolBox.java
+++ b/test/langtools/tools/lib/toolbox/ToolBox.java
@@ -856,7 +856,7 @@ private interface Content {
          * and delegates to a default file manager for input files.
          */
         public MemoryFileManager() {
-            this(ToolProvider.getSystemJavaCompiler().getStandardFileManager(null, null, null));
+            this(ToolProvider.getSystemJavaCompiler().getStandardFileManager(null, null, null), true);
         }
 
         /**
@@ -864,9 +864,11 @@ public MemoryFileManager() {
          * and delegates to a specified file manager for input files.
          *
          * @param fileManager the file manager to be used for input files
+         * @param shouldClose whether the delegate file manager should be closed
+         *     when this instance is closed
          */
-        public MemoryFileManager(JavaFileManager fileManager) {
-            super(fileManager);
+        public MemoryFileManager(JavaFileManager fileManager, boolean shouldClose) {
+            super(fileManager, shouldClose);
             files = new HashMap<>();
         }