diff --git a/manual/Tasks/junitlauncher.html b/manual/Tasks/junitlauncher.html
index 25d9fcce5..ec14e0357 100644
--- a/manual/Tasks/junitlauncher.html
+++ b/manual/Tasks/junitlauncher.html
@@ -42,6 +42,10 @@
     test engine(s) supported by JUnit 5. This task in itself does <i>not</i> understand what a test
     case is nor does it execute the tests itself.
 </p>
+<p>
+    This task captures testoutput and configuration data inside of
+    the <a href="../running.html#tmpdir">temporary directory</a>.
+</p>
 <p>
     <strong>Note</strong>: This task depends on external libraries not included in the Apache Ant
     distribution. See <a href="../install.html#librarydependencies">Library Dependencies</a> for
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/AbstractJUnitResultFormatter.java b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/AbstractJUnitResultFormatter.java
index dc9847d2a..22a11e095 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/AbstractJUnitResultFormatter.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/AbstractJUnitResultFormatter.java
@@ -53,7 +53,7 @@ abstract class AbstractJUnitResultFormatter implements TestResultFormatter {
     @Override
     public void sysOutAvailable(final byte[] data) {
         if (this.sysOutStore == null) {
-            this.sysOutStore = new SysOutErrContentStore(true);
+            this.sysOutStore = new SysOutErrContentStore(context, true);
         }
         try {
             this.sysOutStore.store(data);
@@ -65,7 +65,7 @@ abstract class AbstractJUnitResultFormatter implements TestResultFormatter {
     @Override
     public void sysErrAvailable(final byte[] data) {
         if (this.sysErrStore == null) {
-            this.sysErrStore = new SysOutErrContentStore(false);
+            this.sysErrStore = new SysOutErrContentStore(context, false);
         }
         try {
             this.sysErrStore.store(data);
@@ -212,13 +212,15 @@ abstract class AbstractJUnitResultFormatter implements TestResultFormatter {
             }
         };
 
+        private final TestExecutionContext context;
         private final String tmpFileSuffix;
         private ByteBuffer inMemoryStore = ByteBuffer.allocate(DEFAULT_CAPACITY_IN_BYTES);
         private boolean usingFileStore = false;
         private Path filePath;
         private FileOutputStream fileOutputStream;
 
-        private SysOutErrContentStore(final boolean isSysOut) {
+        private SysOutErrContentStore(final TestExecutionContext context, final boolean isSysOut) {
+            this.context = context;
             this.tmpFileSuffix = isSysOut ? ".sysout" : ".syserr";
         }
 
@@ -261,7 +263,7 @@ abstract class AbstractJUnitResultFormatter implements TestResultFormatter {
 
         private FileOutputStream createFileStore() throws IOException {
             this.filePath = FileUtils.getFileUtils()
-                .createTempFile(null, this.tmpFileSuffix, null, true, true)
+                .createTempFile(context.getProject().orElse(null), null, this.tmpFileSuffix, null, true, true)
                 .toPath();
             return new FileOutputStream(this.filePath.toFile());
         }
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/confined/JUnitLauncherTask.java b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/confined/JUnitLauncherTask.java
index 0d16ed082..fa28844e7 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/confined/JUnitLauncherTask.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/confined/JUnitLauncherTask.java
@@ -226,7 +226,7 @@ public class JUnitLauncherTask extends Task {
 
     private java.nio.file.Path dumpProjectProperties() throws IOException {
         final java.nio.file.Path propsPath = FileUtils.getFileUtils()
-            .createTempFile(null, "properties", null, true, true)
+            .createTempFile(getProject(), null, "properties", null, true, true)
             .toPath();
         final Hashtable<String, Object> props = this.getProject().getProperties();
         final Properties projProperties = new Properties();
@@ -367,7 +367,7 @@ public class JUnitLauncherTask extends Task {
 
     private java.nio.file.Path newLaunchDefinitionXml() {
         return FileUtils.getFileUtils()
-            .createTempFile(null, ".xml", null, true, true)
+            .createTempFile(getProject(), null, ".xml", null, true, true)
             .toPath();
     }