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Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

Description

@TheSnoozer

Hi @ktoso,
before I start working on this issue I wanted to recheck some couple of details.
With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
I have introduced the slf4j-dependency with #194.
However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

I think it's better to illustrate this with an example what the original problem was and what this all means:
Let's start with a simple Mojo just using the getLog()-Method for logging.
This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

We currently have the third option available on the market.
It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
Questions/comments are welcome :-)

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    Avoid the fat-slf4j-jar and solve the logging issue in a better way · Issue #202 · git-commit-id/git-commit-id-maven-plugin · GitHub
    Skip to content

    Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

    Description

    @TheSnoozer

    Hi @ktoso,
    before I start working on this issue I wanted to recheck some couple of details.
    With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
    I have introduced the slf4j-dependency with #194.
    However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

    I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
    Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
    The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

    I think it's better to illustrate this with an example what the original problem was and what this all means:
    Let's start with a simple Mojo just using the getLog()-Method for logging.
    This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
    java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
    Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
    If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
    So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

    java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

    We currently have the third option available on the market.
    It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
    Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

    The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
    Questions/comments are welcome :-)

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Avoid the fat-slf4j-jar and solve the logging issue in a better way · Issue #202 · git-commit-id/git-commit-id-maven-plugin · GitHub
      Skip to content

      Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

      Description

      @TheSnoozer

      Hi @ktoso,
      before I start working on this issue I wanted to recheck some couple of details.
      With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
      I have introduced the slf4j-dependency with #194.
      However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

      I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
      Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
      The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

      I think it's better to illustrate this with an example what the original problem was and what this all means:
      Let's start with a simple Mojo just using the getLog()-Method for logging.
      This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
      java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
      Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
      If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
      So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

      java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

      We currently have the third option available on the market.
      It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
      Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

      The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
      Questions/comments are welcome :-)

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        , 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Avoid the fat-slf4j-jar and solve the logging issue in a better way · Issue #202 · git-commit-id/git-commit-id-maven-plugin · GitHub
        Skip to content

        Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

        Description

        @TheSnoozer

        Hi @ktoso,
        before I start working on this issue I wanted to recheck some couple of details.
        With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
        I have introduced the slf4j-dependency with #194.
        However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

        I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
        Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
        The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

        I think it's better to illustrate this with an example what the original problem was and what this all means:
        Let's start with a simple Mojo just using the getLog()-Method for logging.
        This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
        java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
        Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
        If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
        So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

        java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

        We currently have the third option available on the market.
        It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
        Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

        The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
        Questions/comments are welcome :-)

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          , 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Avoid the fat-slf4j-jar and solve the logging issue in a better way · Issue #202 · git-commit-id/git-commit-id-maven-plugin · GitHub
          Skip to content

          Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

          Description

          @TheSnoozer

          Hi @ktoso,
          before I start working on this issue I wanted to recheck some couple of details.
          With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
          I have introduced the slf4j-dependency with #194.
          However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

          I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
          Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
          The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

          I think it's better to illustrate this with an example what the original problem was and what this all means:
          Let's start with a simple Mojo just using the getLog()-Method for logging.
          This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
          java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
          Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
          If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
          So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

          java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

          We currently have the third option available on the market.
          It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
          Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

          The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
          Questions/comments are welcome :-)

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            , 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Avoid the fat-slf4j-jar and solve the logging issue in a better way · Issue #202 · git-commit-id/git-commit-id-maven-plugin · GitHub
            Skip to content

            Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

            Description

            @TheSnoozer

            Hi @ktoso,
            before I start working on this issue I wanted to recheck some couple of details.
            With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
            I have introduced the slf4j-dependency with #194.
            However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

            I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
            Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
            The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

            I think it's better to illustrate this with an example what the original problem was and what this all means:
            Let's start with a simple Mojo just using the getLog()-Method for logging.
            This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
            java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
            Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
            If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
            So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

            java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

            We currently have the third option available on the market.
            It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
            Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

            The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
            Questions/comments are welcome :-)

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              Avoid the fat-slf4j-jar and solve the logging issue in a better way #202

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              @TheSnoozer

              Hi @ktoso,
              before I start working on this issue I wanted to recheck some couple of details.
              With Issue #191 we got the Request that the plugin ignores MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
              I have introduced the slf4j-dependency with #194.
              However we got some class loading issue with some of the maven versions (#196, #198), which we fixed by creating a uber-jar (#197).

              I just want to quickly recap what I could figure out during the phase I reported this to Maven (https://issues.apache.org/jira/browse/MNG-5835)
              Let's start with the fact that MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn are two complete different things :-)
              The main fact is that the MavenCli considers the -D arguments passed to Maven after the SLF4J logger has already been initialised.

              I think it's better to illustrate this with an example what the original problem was and what this all means:
              Let's start with a simple Mojo just using the getLog()-Method for logging.
              This will take care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package. However it will ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).
              java // plugin one public void execute() { getLog().info("Info-Message: Hello, world."); }
              Let's now move to a simple Mojo that create the getLog() outside the execute and will store it as a variable (that was the way the git-commit-id-plugin had done it's logging). The Problem here as outline in (https://issues.apache.org/jira/browse/MNG-5835)
              If you call getLog() in your constructor then you'll get an instance of SystemStreamLog that unconditionally logs to System.out. Your mojo will be wired with an SLF4J-backed logger after construction. Call getLog() during the execute() method, and don't cache the value.
              So in general this will ignore MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package (as reported). It will also ignore the -D arguments passed to Maven (so it will ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

              java // plugin two private final Log logger = getLog(); public void execute() { logger.info("Info-Message: Hello, world."); }

              We currently have the third option available on the market.
              It used the the slf4-dependencies and wires itself to the slfj-simple-logger.
              Our current solution takes care for MAVEN_OPTS=-Dorg.slf4j.simpleLogger.defaultLogLevel=warn mvn clean package and also takes care of -D arguments passed to Maven (so it will NOT ignore mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn).

              The essence is if there is no one is using the mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLevel=warn-Option we can just drop the fat-slf4j-jar and the dependencies to slf4j and will let getLog take care of the rest. However also outline in https://issues.apache.org/jira/browse/MNG-5835 it may be a bad idea to store to logger somewhere (in the LoggerBridge). I currently don't have a valid reason why not saving it somewhere, but this somehow we definitely need to test.
              Questions/comments are welcome :-)

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