Provider "jar" not found

Jenkins and plugins versions report

Environment

```Jenkins: 2.467-rc35102.e0469e57fcdb_ OS: Linux - 6.1.91-060191-generic Java: 17.0.11 - Eclipse Adoptium (OpenJDK 64-Bit Server VM) --- ant:497.v94e7d9fffa_b_9 antisamy-markup-formatter:162.v0e6ec0fcfcf6 apache-httpcomponents-client-4-api:4.5.14-208.v438351942757 asm-api:9.7-33.v4d23ef79fcc8 bootstrap5-api:5.3.3-1 bouncycastle-api:2.30.1.78.1-248.ve27176eb_46cb_ branch-api:2.1169.va_f810c56e895 build-timeout:1.33 caffeine-api:3.1.8-133.v17b_1ff2e0599 checks-api:2.2.0 cloudbees-folder:6.942.vb_43318a_156b_2 commons-lang3-api:3.14.0-76.vda_5591261cfe commons-text-api:1.12.0-119.v73ef73f2345d configuration-as-code:1810.v9b_c30a_249a_4c credentials:1361.v56f5ca_35d21c credentials-binding:681.vf91669a_32e45 display-url-api:2.204.vf6fddd8a_8b_e9 durable-task:555.v6802fe0f0b_82 echarts-api:5.5.0-1 eddsa-api:0.3.0-4.v84c6f0f4969e font-awesome-api:6.5.2-1 git:5.2.2 git-client:5.0.0 github:1.39.0 github-api:1.318-461.v7a_c09c9fa_d63 github-branch-source:1789.v5b_0c0cea_18c3 gradle:2.12 gson-api:2.11.0-41.v019fcf6125dc instance-identity:185.v303dc7c645f9 ionicons-api:74.v93d5eb_813d5f jackson2-api:2.17.0-379.v02de8ec9f64c jakarta-activation-api:2.1.3-1 jakarta-mail-api:2.1.3-1 javax-activation-api:1.2.0-7 javax-mail-api:1.6.2-10 jaxb:2.3.9-1 jjwt-api:0.11.5-112.ve82dfb_224b_a_d joda-time-api:2.12.7-29.v5a_b_e3a_82269a_ jquery3-api:3.7.1-2 json-api:20240303-41.v94e11e6de726 json-path-api:2.9.0-58.v62e3e85b_a_655 junit:1265.v65b_14fa_f12f0 mailer:472.vf7c289a_4b_420 matrix-auth:3.2.2 matrix-project:832.va_66e270d2946 metrics:4.2.21-451.vd51df8df52ec mina-sshd-api-common:2.13.1-117.v2f1a_b_66ff91d mina-sshd-api-core:2.13.1-117.v2f1a_b_66ff91d okhttp-api:4.11.0-172.vda_da_1feeb_c6e pipeline-build-step:540.vb_e8849e1a_b_d8 pipeline-graph-analysis:216.vfd8b_ece330ca_ pipeline-graph-view:304.va_f2a_16b_e4964 pipeline-groovy-lib:727.ve832a_9244dfa_ pipeline-input-step:495.ve9c153f6067b_ pipeline-milestone-step:119.vdfdc43fc3b_9a_ pipeline-model-api:2.2203.v89fa_170c2b_f5 pipeline-model-definition:2.2203.v89fa_170c2b_f5 pipeline-model-extensions:2.2203.v89fa_170c2b_f5 pipeline-rest-api:2.34 pipeline-stage-step:312.v8cd10304c27a_ pipeline-stage-tags-metadata:2.2203.v89fa_170c2b_f5 pipeline-stage-view:2.34 plain-credentials:183.va_de8f1dd5a_2b_ plugin-util-api:4.1.0 prism-api:1.29.0-15 resource-disposer:0.23 scm-api:690.vfc8b_54395023 script-security:1341.va_2819b_414686 snakeyaml-api:2.2-111.vc6598e30cc65 ssh-credentials:337.v395d2403ccd4 ssh-slaves:2.973.v0fa_8c0dea_f9f sshd:3.330.vc866a_8389b_58 structs:338.v848422169819 timestamper:1.27 token-macro:400.v35420b_922dcb_ trilead-api:2.147.vb_73cc728a_32e variant:60.v7290fc0eb_b_cd workflow-aggregator:600.vb_57cdd26fdd7 workflow-api:1316.v33eb_726c50b_a_ workflow-basic-steps:1058.vcb_fc1e3a_21a_9 workflow-cps:3903.v48a_8836749e9 workflow-durable-task-step:1360.v82d13453da_a_f workflow-job:1426.v2ecb_a_a_42fd46 workflow-multibranch:791.v28fb_f74dfca_e workflow-scm-step:427.v4ca_6512e7df1 workflow-step-api:657.v03b_e8115821b_ workflow-support:907.v6713a_ed8a_573 ws-cleanup:0.46 ```

What Operating System are you using (both controller, and any agents involved in the problem)?

Linux/Docker

Reproduction steps

Build an image through this Dockerfile thanks to docker build ..

Expected Results

No error.

Actual Results

 => ERROR [10/11] RUN which jenkins-plugin-cli && jenkins-plugin-cli --plugin-file /usr/share/jenkins/ref/plugins.txt                                                                       6.6s
------
 > [10/11] RUN which jenkins-plugin-cli && jenkins-plugin-cli --plugin-file /usr/share/jenkins/ref/plugins.txt:
0.120 /usr/bin/jenkins-plugin-cli
6.416 Provider "jar" not found
------
WARNING: No output specified with docker-container driver. Build result will only remain in the build cache. To push result image into registry use --push or to load image into docker use --load
Dockerfile:45
--------------------
  43 |
  44 |     # We use the Jenkins plugin CLI to install the plugins listed in the plugins.txt file.
  45 | >>> RUN which jenkins-plugin-cli && jenkins-plugin-cli --plugin-file /usr/share/jenkins/ref/plugins.txt
  46 |
  47 |     # We copy a pre-configured Jenkins configuration file to the Jenkins ref directory in the image.
--------------------
ERROR: failed to solve: process "/bin/sh -c which jenkins-plugin-cli && jenkins-plugin-cli --plugin-file /usr/share/jenkins/ref/plugins.txt" did not complete successfully: exit code: 1

Anything else?

No response

Are you interested in contributing a fix?

Yes.

I tried to build the current main branch in my Docker container and got:

247.9 [INFO] Running io.jenkins.tools.pluginmanager.impl.ChecksumTest
247.9 [INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.003 s -- in io.jenkins.tools.pluginmanager.impl.ChecksumTest
247.9 [INFO] Running io.jenkins.tools.pluginmanager.config.LogOutputTest
247.9 [INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.006 s -- in io.jenkins.tools.pluginmanager.config.LogOutputTest
248.2 [INFO]
248.2 [INFO] Results:
248.2 [INFO]
248.2 [ERROR] Failures:
248.2 [ERROR]   CacheManagerTest.cacheManagerWithNonReadableJsonFileForKey:159
248.2 Expecting actual:
248.2   ""
248.2 to start with:
248.2   "Cache ignored file the-cache-key.json because it cannot be read.
248.2 java.nio.file.AccessDeniedException:"
248.2
248.2 [ERROR]   CacheManagerTest.cacheReturnsNullWhenCachedFileCannotBeRead:148
248.2 expected: null
248.2  but was: {}
248.2 [ERROR] Errors:
248.2 [ERROR]   PluginManagerTest.startNoDirectoryNoPluginDirTest:143 » ProviderNotFound Provider "jar" not found
248.2 [INFO]
248.2 [ERROR] Tests run: 151, Failures: 2, Errors: 1, Skipped: 3
248.2 [INFO]
248.2 [INFO] ------------------------------------------------------------------------
248.2 [INFO] Reactor Summary for plugin-management-parent-pom 2.13.1-SNAPSHOT:
248.2 [INFO]
248.2 [INFO] plugin-management-parent-pom ....................... SUCCESS [02:21 min]
248.2 [INFO] plugin-management-library .......................... FAILURE [01:33 min]
248.2 [INFO] plugin-management-cli .............................. SKIPPED
248.2 [INFO] ------------------------------------------------------------------------
248.2 [INFO] BUILD FAILURE

It builds correctly on the same machine without Docker for JDK 17 and 21. 🤔

Thanks to the assistance of @MarkEWaite, we've identified and resolved the issue with the Docker image that was causing problems with the Jenkins WAR file.

Root Cause

The problem stemmed from an incorrect ENV variable declaration in the Dockerfile. Specifically:

I mistakenly used {} in the ENV variable declaration.
This resulted in an empty WAR file, rendering Jenkins unusable.

Solution

The issue was resolved by correcting the ENV declaration in the Dockerfile:

Removed the {} from the ENV variable declaration.
After this correction, everything began functioning properly.

Lessons Learned

Pay close attention to syntax in Dockerfile ENV declarations.
Avoid using {} in ENV variables within Dockerfiles.

Next Steps

We can consider closing this issue.
Alternatively, we could keep it open to improve the error message:
- Current message: "jar: Provider not found"
- While this gave us some clues, a more descriptive error message could be helpful.

Reflection

Although it's unlikely that others will encounter this specific error, improving error messages can always benefit users and troubleshooting processes.

Acknowledgment

I take responsibility for this oversight. Thank you to everyone involved in helping diagnose and resolve this issue.

jenkinsci / plugin-installation-manager-tool