Jetty 12: `ContextHandler.getTempDirectory()` does not respect the `Context.getTempDirectory()` contract (#11397)

#11396 fix ContextHandler.getTempDirectory() so it never returns null as the contract mandates

Signed-off-by: Ludovic Orban <lorban@bitronix.be>

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ContextHandler.java

@@ -1126,7 +1126,7 @@ public class ContextHandler extends Handler.Wrapper implements Attributes, Alias
         {
             File tempDirectory = ContextHandler.this.getTempDirectory();
             if (tempDirectory == null)
-                tempDirectory = getServer().getTempDirectory();
+                tempDirectory = getServer().getContext().getTempDirectory();
             return tempDirectory;
         }
 

jetty-core/jetty-server/src/test/java/org/eclipse/jetty/server/ServerTest.java

@@ -13,6 +13,7 @@
 
 package org.eclipse.jetty.server;
 
+import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
@@ -44,6 +45,7 @@ import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.nullValue;
 
 public class ServerTest
 {
@@ -109,6 +111,13 @@ public class ServerTest
         _connector = null;
     }
 
+    @Test
+    public void testContextTempDirectory()
+    {
+        File tempDirectory = _server.getContext().getTempDirectory();
+        assertThat(tempDirectory, not(nullValue()));
+    }
+
     @Test
     public void testSimpleGET() throws Exception
     {

jetty-core/jetty-server/src/test/java/org/eclipse/jetty/server/handler/ContextHandlerTest.java

@@ -86,6 +86,7 @@ import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
 import static org.hamcrest.Matchers.sameInstance;
@@ -136,6 +137,17 @@ public class ContextHandlerTest
         FS.ensureDeleted(TEST_BAD.toPath());
     }
 
+    @Test
+    public void testContextTempDirectory() throws Exception
+    {
+        HelloHandler helloHandler = new HelloHandler();
+        _contextHandler.setHandler(helloHandler);
+        _server.start();
+
+        File tempDirectory = _contextHandler.getContext().getTempDirectory();
+        assertThat(tempDirectory, not(nullValue()));
+    }
+
     @Test
     public void testMiss() throws Exception
     {

jetty-ee10/jetty-ee10-servlet/src/test/java/org/eclipse/jetty/ee10/servlet/MultiPartServletTest.java

@@ -371,6 +371,58 @@ public class MultiPartServletTest
         assertThat(fileList.length, is(0));
     }
 
+    @ParameterizedTest
+    @ValueSource(booleans = {true, false})
+    public void testDefaultTempDirectory(boolean eager) throws Exception
+    {
+        start(new HttpServlet()
+        {
+            @Override
+            protected void service(HttpServletRequest request, HttpServletResponse response1) throws ServletException, IOException
+            {
+                Collection<Part> parts = request.getParts();
+                assertNotNull(parts);
+                assertEquals(1, parts.size());
+                Part part = parts.iterator().next();
+                assertEquals("part1", part.getName());
+                Collection<String> headerNames = part.getHeaderNames();
+                assertNotNull(headerNames);
+                assertEquals(2, headerNames.size());
+                String content1 = IO.toString(part.getInputStream(), UTF_8);
+                assertEquals("content1", content1);
+            }
+        }, new MultipartConfigElement(null, MAX_FILE_SIZE, -1, 0), eager);
+
+        try (Socket socket = new Socket("localhost", connector.getLocalPort()))
+        {
+            OutputStream output = socket.getOutputStream();
+
+            String content = """
+                --A1B2C3
+                Content-Disposition: form-data; name="part1"
+                Content-Type: text/plain; charset="UTF-8"
+                                
+                content1
+                --A1B2C3--
+                """;
+            String header = """
+                POST / HTTP/1.1
+                Host: localhost
+                Content-Type: multipart/form-data; boundary="A1B2C3"
+                Content-Length: $L
+                                
+                """.replace("$L", String.valueOf(content.length()));
+
+            output.write(header.getBytes(UTF_8));
+            output.write(content.getBytes(UTF_8));
+            output.flush();
+
+            HttpTester.Response response = HttpTester.parseResponse(socket.getInputStream());
+            assertNotNull(response);
+            assertEquals(HttpStatus.OK_200, response.getStatus());
+        }
+    }
+
     @ParameterizedTest
     @ValueSource(booleans = {true, false})
     public void testMultiPartGzip(boolean eager) throws Exception