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https://issues.apache.org/jira/browse/MNG-8177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17872436#comment-17872436
 ] 

ASF GitHub Bot commented on MNG-8177:
-------------------------------------

slawekjaranowski commented on code in PR #1633:
URL: https://github.com/apache/maven/pull/1633#discussion_r1712041455


##########
maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/RequestTraceHelper.java:
##########
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.repository.internal;
+
+import java.util.stream.Collectors;
+
+import org.apache.maven.model.Plugin;
+import org.eclipse.aether.RequestTrace;
+import org.eclipse.aether.collection.CollectRequest;
+import org.eclipse.aether.collection.CollectStepData;
+import org.eclipse.aether.resolution.ArtifactDescriptorRequest;
+import org.eclipse.aether.resolution.ArtifactRequest;
+import org.eclipse.aether.resolution.DependencyRequest;
+
+/**
+ * Helper class to manage {@link RequestTrace} for better error logging.
+ *
+ * @since 3.9.9
+ */
+public final class RequestTraceHelper {
+
+    /**
+     * Method that creates some informational string based on passed in {@link 
RequestTrace}. The contents of request
+     * trace can literally be anything, but this class tries to cover "most 
common" cases that are happening in Maven.
+     */
+    public static String interpretTrace(boolean explain, RequestTrace 
requestTrace) {
+        while (requestTrace != null) {
+            Object data = requestTrace.getData();
+            if (data instanceof DependencyRequest) {
+                DependencyRequest request = (DependencyRequest) data;
+                return (explain ? "dependency request for " : "") + request;
+            } else if (data instanceof CollectRequest) {
+                CollectRequest request = (CollectRequest) data;
+                return (explain ? "collect request for " : "") + request;
+            } else if (data instanceof CollectStepData) {
+                CollectStepData stepData = (CollectStepData) data;
+                return (explain ? "collect path " : "")
+                        + 
stepData.getPath().stream().map(Object::toString).collect(Collectors.joining(" 
-> "));

Review Comment:
   It can generate very long one line message ... maybe more readable will be 
separated by new line



##########
maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/RequestTraceHelper.java:
##########
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.repository.internal;
+
+import java.util.stream.Collectors;
+
+import org.apache.maven.model.Plugin;
+import org.eclipse.aether.RequestTrace;
+import org.eclipse.aether.collection.CollectRequest;
+import org.eclipse.aether.collection.CollectStepData;
+import org.eclipse.aether.resolution.ArtifactDescriptorRequest;
+import org.eclipse.aether.resolution.ArtifactRequest;
+import org.eclipse.aether.resolution.DependencyRequest;
+
+/**
+ * Helper class to manage {@link RequestTrace} for better error logging.
+ *
+ * @since 3.9.9
+ */
+public final class RequestTraceHelper {
+
+    /**
+     * Method that creates some informational string based on passed in {@link 
RequestTrace}. The contents of request
+     * trace can literally be anything, but this class tries to cover "most 
common" cases that are happening in Maven.
+     */
+    public static String interpretTrace(boolean explain, RequestTrace 
requestTrace) {

Review Comment:
   `explain`  is always `true` 





> Warning "'dependencyManagement.dependencies.dependency.systemPath' for 
> com.sun:tools:jar refers to a non-existing file 
> C:\Temp\jdk-11.0.23\..\lib\tools.jar"
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MNG-8177
>                 URL: https://issues.apache.org/jira/browse/MNG-8177
>             Project: Maven
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 3.9.8
>         Environment: Java 11
>            Reporter: Wolfgang Knauf
>            Assignee: Tamas Cservenak
>            Priority: Minor
>             Fix For: 4.0.0, 3.9.9, 4.0.0-beta-4
>
>
> This warning pops up first with Maven 3.9.8, previous versions up to 3.9.7 
> did not report it:
> {{[WARNING] 1 problem was encountered while building the effective model for 
> org.jboss:jboss-dmr:jar:1.3.0.Final}}
> When using the "-X" switch, I see this additional message:
> {{[WARNING] 'dependencyManagement.dependencies.dependency.systemPath' for 
> com.sun:tools:jar refers to a non-existing file 
> C:\Temp\jdk-11.0.23\..\lib\tools.jar. Please verify that you run Maven using 
> a JDK and not just a JRE. @ org.jboss:jboss-dmr:1.3.0.Final}}
>  
> I run it with JDK 11, but downloaded the zip file only. There is no 
> "tools.jar", which was removed as part of Java 9.
>  
> To reproduce: create a project from this archetype:
> {{mvn archetype:generate -DarchetypeCatalog=local -DgroupId=com.acme 
> -DartifactId=example-subsystem -Dversion=1.0-SNAPSHOT 
> -Dmodule=org.test.subsystem -Dpackage=com.acme.example 
> -DarchetypeGroupId=org.wildfly.archetype 
> -DarchetypeArtifactId=wildfly-subsystem -DarchetypeVersion=32.0.0.Final 
> -DinteractiveMode=false}}
>  
> Then run this command to see the warning:
> {{mvn dependency:tree -X}}
>  
> Actually, I don't know why jboss-dmr:1.3.0 is tested, as the project should 
> reference jboss-dmr:1.7.0.



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