Mike Jumper created GUACAMOLE-1788:
--------------------------------------

             Summary: Build fails against Maven 3.9.x
                 Key: GUACAMOLE-1788
                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-1788
             Project: Guacamole
          Issue Type: Bug
          Components: guacamole-client
            Reporter: Mike Jumper


When building guacamole-client against a newer version of Maven (3.9.x), the 
guacamole-common-js portion of the build fails with the following error:

{code:none}
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  26.466 s
[INFO] Finished at: 2023-05-13T16:42:59Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal 
com.github.buckelieg:minify-maven-plugin:2.0.1:minify (default-minify) on 
project guacamole-common-js: Execution default-minify of goal 
com.github.buckelieg:minify-maven-plugin:2.0.1:minify failed: A required class 
was missing while executing 
com.github.buckelieg:minify-maven-plugin:2.0.1:minify: 
org/codehaus/plexus/util/DirectoryScanner
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>com.github.buckelieg:minify-maven-plugin:2.0.1
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = 
file:/root/.m2/repository/com/github/buckelieg/minify-maven-plugin/2.0.1/minify-maven-plugin-2.0.1.jar
[ERROR] urls[1] = 
file:/root/.m2/repository/com/yahoo/platform/yui/yuicompressor/2.4.8/yuicompressor-2.4.8.jar
[ERROR] urls[2] = file:/root/.m2/repository/rhino/js/1.7R2/js-1.7R2.jar
[ERROR] urls[3] = 
file:/root/.m2/repository/com/google/javascript/closure-compiler/v20190929/closure-compiler-v20190929.jar
[ERROR] urls[4] = 
file:/root/.m2/repository/com/google/javascript/closure-compiler-externs/v20190929/closure-compiler-externs-v20190929.jar
[ERROR] urls[5] = 
file:/root/.m2/repository/args4j/args4j/2.0.26/args4j-2.0.26.jar
[ERROR] urls[6] = 
file:/root/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.1/error_prone_annotations-2.3.1.jar
[ERROR] urls[7] = 
file:/root/.m2/repository/com/google/guava/guava/25.1-jre/guava-25.1-jre.jar
[ERROR] urls[8] = 
file:/root/.m2/repository/org/checkerframework/checker-qual/2.0.0/checker-qual-2.0.0.jar
[ERROR] urls[9] = 
file:/root/.m2/repository/com/google/j2objc/j2objc-annotations/1.1/j2objc-annotations-1.1.jar
[ERROR] urls[10] = 
file:/root/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.14/animal-sniffer-annotations-1.14.jar
[ERROR] urls[11] = 
file:/root/.m2/repository/com/google/protobuf/protobuf-java/3.0.2/protobuf-java-3.0.2.jar
[ERROR] urls[12] = 
file:/root/.m2/repository/com/google/code/findbugs/jsr305/3.0.1/jsr305-3.0.1.jar
[ERROR] urls[13] = 
file:/root/.m2/repository/com/google/jsinterop/jsinterop-annotations/1.0.0/jsinterop-annotations-1.0.0.jar
[ERROR] urls[14] = 
file:/root/.m2/repository/com/google/re2j/re2j/1.3/re2j-1.3.jar
[ERROR] urls[15] = 
file:/root/.m2/repository/com/google/code/gson/gson/2.8.6/gson-2.8.6.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
[ERROR] 
[ERROR] -----------------------------------------------------
[ERROR] : org.codehaus.plexus.util.DirectoryScanner
[ERROR] -> [Help 1]
...
{code}

This is apparently due to Maven no longer automatically injecting 
{{plexus-utils}}. That behavior is considered legacy after Maven2, but the 
{{maven-minify-plugin}} used by guacamole-common-js has not been updated to 
take this into account.

See:

* https://ci-builds.apache.org/job/Guacamole/job/guacamole-client-master/235/
* MNG-7744 - "Maven 3.9.0 and 3.9.1 break compatibility with Apache Mina SSHD 
build"
* MNG-7355 - "Error with minify"



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