downgrade test-helper for now

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

jetty-ee9/jetty-ee9-servlet/src/test/java/org/eclipse/jetty/ee9/servlet/AsyncServletTest.java

@@ -55,6 +55,7 @@
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.Isolated;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.contains;
@@ -63,6 +64,7 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@Isolated
 public class AsyncServletTest
 {
     protected AsyncServlet _servlet = new AsyncServlet();

jetty-ee9/jetty-ee9-servlet/src/test/java/org/eclipse/jetty/ee9/servlet/DispatcherTest.java

@@ -73,6 +73,7 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.Isolated;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -85,6 +86,7 @@
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@Isolated
 public class DispatcherTest
 {
     private static final Logger LOG = LoggerFactory.getLogger(DispatcherTest.class);

pom.xml

@@ -236,7 +236,7 @@
     <jetty-version.maven.plugin.version>2.7</jetty-version.maven.plugin.version>
     <jetty.perf-helper.version>1.0.7</jetty.perf-helper.version>
     <jetty.surefire.argLine>-Dfile.encoding=UTF-8 -Duser.language=en -Duser.region=US -Djava.io.tmpdir=${project.build.directory} -showversion -Xmx6g -Xms4g -Xlog:gc:stderr:time,level,tags</jetty.surefire.argLine>
-    <jetty.test.version>6.4</jetty.test.version>
+    <jetty.test.version>6.3</jetty.test.version>
     <jetty.testtracker.log>true</jetty.testtracker.log>
     <jetty.unixdomain.dir>/tmp</jetty.unixdomain.dir>
     <jetty.url>https://jetty.org/</jetty.url>