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retransform < span class = "token parameter variable" > -l< / span >
retransform < span class = "token parameter variable" > -d< / span > < span class = "token number" > 1< / span > < span class = "token comment" > # delete retransform entry< / span >
retransform < span class = "token parameter variable" > --deleteAll< / span > < span class = "token comment" > # delete all retransform entries< / span >
retransform < span class = "token parameter variable" > --classPattern< / span > demo.* < span class = "token comment" > # triger retransform classes< / span >
retransform < span class = "token parameter variable" > -c< / span > 327a647b /tmp/Test.class /tmp/Test< span class = "token punctuation" > \< / span > < span class = "token variable" > $Inner< / span > .class
retransform < span class = "token parameter variable" > --classLoaderClass< / span > < span class = "token string" > ' sun.misc.Launcher$AppClassLoader' < / span > /tmp/Test.class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "retransform-the-specified-class-file" tabindex = "-1" > < a class = "header-anchor" href = "#retransform-the-specified-class-file" aria-hidden = "true" > #< / a > retransform the specified .class file< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ retransform /tmp/MathGame.class
retransform success, size: < span class = "token number" > 1< / span > , classes:
demo.MathGame
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > Load the specified .class file, then parse out the class name, and then retransform the corresponding class loaded in the jvm. Every time a < code > .class< / code > file is loaded, a retransform entry is recorded.< / p > < div class = "custom-container tip" > < p class = "custom-container-title" > TIP< / p > < p > If retransform is executed multiple times to load the same class file, there will be multiple retransform entries.< / p > < / div > < h2 id = "view-retransform-entry" tabindex = "-1" > < a class = "header-anchor" href = "#view-retransform-entry" aria-hidden = "true" > #< / a > View retransform entry< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ retransform < span class = "token parameter variable" > -l< / span >
Id ClassName TransformCount LoaderHash LoaderClassName
< span class = "token number" > 1< / span > demo.MathGame < span class = "token number" > 1< / span > null null
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > TransformCount counts the times of attempts to return the .class file corresponding to the entry in the ClassFileTransformer#transform method, but it does not mean that the transform must be successful.< / li > < / ul > < h2 id = "delete-the-specified-retransform-entry" tabindex = "-1" > < a class = "header-anchor" href = "#delete-the-specified-retransform-entry" aria-hidden = "true" > #< / a > Delete the specified retransform entry< / h2 > < p > Need to specify id:< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > retransform < span class = "token parameter variable" > -d< / span > < span class = "token number" > 1< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "delete-all-retransform-entries" tabindex = "-1" > < a class = "header-anchor" href = "#delete-all-retransform-entries" aria-hidden = "true" > #< / a > Delete all retransform entries< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > retransform < span class = "token parameter variable" > --deleteAll< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "explicitly-trigger-retransform" tabindex = "-1" > < a class = "header-anchor" href = "#explicitly-trigger-retransform" aria-hidden = "true" > #< / a > Explicitly trigger retransform< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ retransform < span class = "token parameter variable" > --classPattern< / span > demo.MathGame
retransform success, size: < span class = "token number" > 1< / span > , classes:
demo.MathGame
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < div class = "custom-container warning" > < p class = "custom-container-title" > WARNING< / p > < p > Note: For the same class, when there are multiple retransform entries, if retransform is explicitly triggered, the entry added last will take effect (the one with the largest id).< / p > < / div > < h2 id = "eliminate-the-influence-of-retransform" tabindex = "-1" > < a class = "header-anchor" href = "#eliminate-the-influence-of-retransform" aria-hidden = "true" > #< / a > Eliminate the influence of retransform< / h2 > < p > If you want to eliminate the impact after performing retransform on a class, you need to:< / p > < ul > < li > Delete the retransform entry corresponding to this class< / li > < li > Re-trigger retransform< / li > < / ul > < div class = "custom-container tip" > < p class = "custom-container-title" > TIP< / p > < p > If you do not clear all retransform entries and trigger retransform again, the retransformed classes will still take effect when arthas stop.< / p > < / div > < h2 id = "use-with-the-jad-mc-command" tabindex = "-1" > < a class = "header-anchor" href = "#use-with-the-jad-mc-command" aria-hidden = "true" > #< / a > Use with the jad/mc command< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > jad --source-only com.example.demo.arthas.user.UserController < span class = "token operator" > > < / span > /tmp/UserController.java
< span class = "token function" > mc< / span > /tmp/UserController.java < span class = "token parameter variable" > -d< / span > /tmp
retransform /tmp/com/example/demo/arthas/user/UserController.class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > Use < code > jad< / code > command to decompile bytecode, and then you can use other editors, such as vim to modify the source code.< / li > < li > < code > mc< / code > command to compile the modified code< / li > < li > Load new bytecode with < code > retransform< / code > command< / li > < / ul > < h2 id = "tips-for-uploading-class-files-to-the-server" tabindex = "-1" > < a class = "header-anchor" href = "#tips-for-uploading-class-files-to-the-server" aria-hidden = "true" > #< / a > Tips for uploading .class files to the server< / h2 > < p > The < code > mc< / code > command may fail. You can modify the code locally, compile it, and upload it to the server. Some servers do not allow direct uploading files, you can use the < code > base64< / code > command to bypass.< / p > < ol > < li > < p > Convert the < code > .class< / code > file to base64 first, then save it as result.txt< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > Base64 < span class = "token operator" > < < / span > Test.class < span class = "token operator" > > < / span > result.txt
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < / li > < li > < p > Login the server, create and edit < code > result.txt< / code > , copy the local content, paste and save< / p > < / li > < li > < p > Restore < code > result.txt< / code > on the server to < code > .class< / code > < / p > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > Base64 -d < result.txt > Test.class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < / li > < li > < p > Use the md5 command to verify that the < code > .class< / code > files are consistent.< / p > < / li > < / ol > < h2 id = "restrictions-of-the-retransform-command" tabindex = "-1" > < a class = "header-anchor" href = "#restrictions-of-the-retransform-command" aria-hidden = "true" > #< / a > Restrictions of the retransform command< / h2 > < ul > < li > New field/method is not allowed< / li > < li > The function that is running, no exit can not take effect, such as the new < code > System.out.println< / code > added below, only the < code > run()< / code > function will take effect.< / li > < / ul > < div class = "language-java ext-java line-numbers-mode" > < pre class = "language-java" > < code > < span class = "token keyword" > public< / span > < span class = "token keyword" > class< / span > < span class = "token class-name" > MathGame< / span > < span class = "token punctuation" > {< / span >
< span class = "token keyword" > public< / span > < span class = "token keyword" > static< / span > < span class = "token keyword" > void< / span > < span class = "token function" > main< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > String< / span > < span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > args< span class = "token punctuation" > )< / span > < span class = "token keyword" > throws< / span > < span class = "token class-name" > InterruptedException< / span > < span class = "token punctuation" > {< / span >
< span class = "token class-name" > MathGame< / span > game < span class = "token operator" > =< / span > < span class = "token keyword" > new< / span > < span class = "token class-name" > MathGame< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token keyword" > while< / span > < span class = "token punctuation" > (< / span > < span class = "token boolean" > true< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > {< / span >
game< span class = "token punctuation" > .< / span > < span class = "token function" > run< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token class-name" > TimeUnit< / span > < span class = "token punctuation" > .< / span > < span class = "token constant" > SECONDS< / span > < span class = "token punctuation" > .< / span > < span class = "token function" > sleep< / span > < span class = "token punctuation" > (< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token comment" > // This doesn' t work because the code keeps running in while< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " in loop" < / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
< span class = "token keyword" > public< / span > < span class = "token keyword" > void< / span > < span class = "token function" > run< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token keyword" > throws< / span > < span class = "token class-name" > InterruptedException< / span > < span class = "token punctuation" > {< / span >
< span class = "token comment" > // This works because the run() function ends completely every time< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " call run()" < / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token keyword" > try< / span > < span class = "token punctuation" > {< / span >
< span class = "token keyword" > int< / span > number < span class = "token operator" > =< / span > random< span class = "token punctuation" > .< / span > < span class = "token function" > nextInt< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token class-name" > List< / span > < span class = "token generics" > < span class = "token punctuation" > < < / span > < span class = "token class-name" > Integer< / span > < span class = "token punctuation" > > < / span > < / span > primeFactors < span class = "token operator" > =< / span > < span class = "token function" > primeFactors< / span > < span class = "token punctuation" > (< / span > number< span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token function" > print< / span > < span class = "token punctuation" > (< / span > number< span class = "token punctuation" > ,< / span > primeFactors< span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span > < span class = "token keyword" > catch< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > Exception< / span > e< span class = "token punctuation" > )< / span > < span class = "token punctuation" > {< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > String< / span > < span class = "token punctuation" > .< / span > < span class = "token function" > format< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " illegalArgumentCount:%3d, " < / span > < span class = "token punctuation" > ,< / span > illegalArgumentCount< span class = "token punctuation" > )< / span > < span class = "token operator" > +< / span > e< span class = "token punctuation" > .< / span > < span class = "token function" > getMessage< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta right-menu-padding" data-v-fdd717e0 > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/retransform.md" rel = "noopener noreferrer" target = "_blank" aria-label = "Edit this page on GitHub" > <!-- [ --> <!-- ] --> < span > Edit this page on GitHub< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > open in new window< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > Contributors: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: i@fatpandac.com" > Fatpandac< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > < nav class = "page-nav right-menu-padding" data-v-fdd717e0 > < p class = "inner" > < span class = "prev" > < a href = "/en/doc/reset.html" class = "" aria-label = "reset" > <!-- [ --> <!-- ] --> reset <!-- [ --> <!-- ] --> < / a > < / span > < span class = "next" > < a href = "/en/doc/sc.html" class = "" aria-label = "sc" > <!-- [ --> <!-- ] --> sc <!-- [ --> <!-- ] --> < / a > < / span > < / p > < / nav > <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
< script type = "module" src = "/assets/app.1e03d722.js" defer > < / script >
< / body >
< / html >
