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leaningtech / cheerpj-meta

Run Java 8 applications, libraries, applets, Java Web Start, and Oracle Forms on the web without legacy plugins.
https://labs.leaningtech.com/cheerpj
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NoSuchMethodErrors are not being caught and processed in compiled code #146

Closed objectconnexions closed 2 years ago

objectconnexions commented 2 years ago

I had a problem running a very basic application, which failed to start. Tracking down the issue lead to an unusual practice in one of the dependent libraries. It was attempting to execute a method and was expecting to catch the NoSuchMethodError when it can't be found. However your code (cheerpJ) just fails with the thrown error (see below), thereby not executing the remaining code and preventing the application from running. This is in a common Java logging library--logback, specifically in the MDC class in the slf4j-api library, as shown below.

    private static MDCAdapter bwCompatibleGetMDCAdapterFromBinder() throws NoClassDefFoundError {
        try {
            return StaticMDCBinder.getSingleton().getMDCA();
        } catch (NoSuchMethodError nsme) {
            // binding is probably a version of SLF4J older than 1.7.14
            return StaticMDCBinder.SINGLETON.getMDCA();
        }
    }

Unfortunately the implementation they provide (the logback-classic package) for the bindings does not follow their own suggestions. So, this problem will show up for anybody running code using this logging on your JVM. It is possible to use the log level to control the logging and by turning it to OFF then no attempts to log are made. Alternately, swap to an earlier version (latest logback-classic of 1.1.3), which unfortunately is from many years ago.

Exception displayed:-

Uncaught ReferenceError: _n4_WObjeC0Z2getSingletonEU is not defined
    _c4pbAiW0VVuGNCB2XDNhyX5W8amHeSqasmz2XPna8mre9f5WSH0mqe5vd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    _c4pbAiW0nVuGNCB2Xfh7vtd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    N3org5slf4j3MDCX http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:143
    cjG https://cjrtnc.leaningtech.com/2.2/loader.js:2674
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtUTxfrZu9UbXKzhxAKZdr0eMjWJN9o http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtcUxfrZKn_teXdqeXNtuhrbrueXqAKJaHKerIiel http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaaQTGcUGteHnnk10d1e7uebaJ2Zdrdbzjq5bhy0cd7vBd http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaaYSGcUGteXEKZYcbqlC_QriK8hYcH2Zdrdbzjq5bhy0cd7vxd http://localhost:8080/libs/logback-core-1.2.10.jar.js:1128
    _c4_X2ch3qoseuPaa$TGcUGteHnnk10d1e7uebaJ2ZdrZarKoqriiSho http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaaAUGcUGteHTUBJewJWrKtdsgXG2ZdrZar0gGeb_GJroiSNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1391
    _c4_X2ch3qoseuPaaAUGcUGteXT0dITT2ZdrZarK20eGWbqWcHiZZIDnqrxyCPJZdAdsJmSKNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1238
    _c4_X2ch3qoseuPaacUGYUWcGKeIGEPJHbrKDnWZdrZqPJZdAJwrliaVel5vRd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaoUGYUWcGKeIGEPJHbru9TaWYI2ZdrZarKKxDo http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaITGYUWcGKeIGEPJHbrKTEafYYarmmG7r7vr0mP1mO98q0m4zNd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaYUGYUWcGKeIGEPJHbrKTDbYYerKwZqPJXp9pA0D6cLKNTn http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaMTGYUWcGKeIGEPJHbreostHJNon http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    anonymous https://cjrtnc.leaningtech.com/2.2/loader.js line 218 > Function:3
    runContinuationStack https://cjrtnc.leaningtech.com/2.2/loader.js:489
    cheerpjSchedule https://cjrtnc.leaningtech.com/2.2/loader.js:1220
    cheerpjSchedInit https://cjrtnc.leaningtech.com/2.2/loader.js:895
    cheerpjInitOnce https://cjrtnc.leaningtech.com/2.2/loader.js:919
    cheerpjInit https://cjrtnc.leaningtech.com/2.2/loader.js:2122
    <anonymous> http://localhost:8080/test.html:11

Obviously other users of this trick might exist.

alexp-sssup commented 2 years ago

We believe the problem to be simply that the StaticMDCBinder class is available in the classpath. Can you share a fully reproducible example? We strongly prefer binary JARs, the code is not required.

objectconnexions commented 2 years ago

Attached is the example I am running. example.zip

Compiled it with

/tmp/cheerpj_linux_2.2/cheerpj_2.2/cheerpjfy.py target/example.jar --deps target/libs/logback-classic-1.2.10.jar:target/libs/logback-core
-1.2.10.jar:target/libs/slf4j-api-1.7.32.jar

Error is:-

Uncaught ReferenceError: _n4_WObjeC0Z2getSingletonEU is not defined
    _c4pbAiW0VVuGNCB2XDNhyX5W8amHeSqasmz2XPna8mre9f5WSH0mqe5vd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    _c4pbAiW0nVuGNCB2Xfh7vtd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    N3org5slf4j3MDCX http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:143
    cjG https://cjrtnc.leaningtech.com/2.2/loader.js:2674
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtUTxfrZu9UbXKzhxAKZdr0eMjWJN9o http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtcUxfrZKn_teXdqeXNtuhrbrueXqAKJaHKerIiel http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaaQTGcUGteHnnk10d1e7uebaJ2Zdrdbzjq5bhy0cd7vBd http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaa$TGcUGteHnnk10d1e7uebaJ2ZdrZarKoqriiSho http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaaAUGcUGteHTUBJewJWrKtdsgXG2ZdrZar0gGeb_GJroiSNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1391
    _c4_X2ch3qoseuPaaAUGcUGteXT0dITT2ZdrZarK20eGWbqWcHiZZIDnqrxyCPJZdAdsJmSKNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1238
    _c4_X2ch3qoseuPaacUGYUWcGKeIGEPJHbrKDnWZdrZqPJZdAJwrliaVel5vRd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaoUGYUWcGKeIGEPJHbru9TaWYI2ZdrZarKKxDo http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaITGYUWcGKeIGEPJHbrKTEafYYarmmG7r7vr0mP1mO98q0m4zNd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaasUGYUWcGKeIGEPJHbrunEbYYerKwZqPJXFTN9n http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaQTGYUWcGKeIGEPJHbruoruKtKhEp http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4VY7example9EgDG0$212mouseDraggedE2 http://localhost:8080/example.jar.js:16
    _h4V33awt9Component23processMouseMoeWtYEventE215 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4p43awt9Component12processEventE210 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4_33awt9Container12processEventE77 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1326
    _h4p33awt6Window12processEventE73 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1032
    _h4F53awt9Component17dispatchEventImplE162 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4p53awt9Container17dispatchEventImplE79 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1326
    _h4F43awt6Window17dispatchEventImplE99 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1032
    _h4F43awt9Component13dispatchEventE161 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4V23awt10EventQueue17dispatchfnXXImplE23 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:881
    _h4p23awt12EventQueue$33runE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:709
    _h4p23awt12EventQueue$33runE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:709
    _h4FcIdj4AccessController12doPrivilegedE3 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:818
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4p23awt12EventQueue$43runE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:858
    _h4p23awt12EventQueue$43runE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:858
    _h4FcIdj4AccessController12doPrivilegedE3 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:818
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4V23awt10EventQueue13dispatchfnXWE21 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:881
    anonymous https://cjrtnc.leaningtech.com/2.2/loader.js line 218 > Function:5
    runContinuationStack https://cjrtnc.leaningtech.com/2.2/loader.js:489
    cheerpjSchedule https://cjrtnc.leaningtech.com/2.2/loader.js:1220
    cheerpjSchedInit https://cjrtnc.leaningtech.com/2.2/loader.js:895
    cheerpjInitOnce https://cjrtnc.leaningtech.com/2.2/loader.js:919
    cheerpjInit https://cjrtnc.leaningtech.com/2.2/loader.js:2122
    <anonymous> http://localhost:8080/test.html:11
slf4j-api-1.7.32.jar.js:145:243
    _c4pbAiW0VVuGNCB2XDNhyX5W8amHeSqasmz2XPna8mre9f5WSH0mqe5vd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    _c4pbAiW0nVuGNCB2Xfh7vtd http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:145
    N3org5slf4j3MDCX http://localhost:8080/libs/slf4j-api-1.7.32.jar.js:143
    cjG https://cjrtnc.leaningtech.com/2.2/loader.js:2674
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtUTxfrZu9UbXKzhxAKZdr0eMjWJN9o http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaagTGYUWcGKeIWT0dsTDPbtcUxfrZKn_teXdqeXNtuhrbrueXqAKJaHKerIiel http://localhost:8080/libs/logback-classic-1.2.10.jar.js:619
    _c4_X2ch3qoseuPaaQTGcUGteHnnk10d1e7uebaJ2Zdrdbzjq5bhy0cd7vBd http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaa$TGcUGteHnnk10d1e7uebaJ2ZdrZarKoqriiSho http://localhost:8080/libs/logback-core-1.2.10.jar.js:782
    _c4_X2ch3qoseuPaaAUGcUGteHTUBJewJWrKtdsgXG2ZdrZar0gGeb_GJroiSNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1391
    _c4_X2ch3qoseuPaaAUGcUGteXT0dITT2ZdrZarK20eGWbqWcHiZZIDnqrxyCPJZdAdsJmSKNn http://localhost:8080/libs/logback-core-1.2.10.jar.js:1238
    _c4_X2ch3qoseuPaacUGYUWcGKeIGEPJHbrKDnWZdrZqPJZdAJwrliaVel5vRd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaoUGYUWcGKeIGEPJHbru9TaWYI2ZdrZarKKxDo http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaITGYUWcGKeIGEPJHbrKTEafYYarmmG7r7vr0mP1mO98q0m4zNd http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaasUGYUWcGKeIGEPJHbrunEbYYerKwZqPJXFTN9n http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4_X2ch3qoseuPaaQTGYUWcGKeIGEPJHbruoruKtKhEp http://localhost:8080/libs/logback-classic-1.2.10.jar.js:247
    _c4VY7example9EgDG0$212mouseDraggedE2 http://localhost:8080/example.jar.js:16
    _h4V33awt9Component23processMouseMoeWtYEventE215 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4p43awt9Component12processEventE210 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4_33awt9Container12processEventE77 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1326
    _h4p33awt6Window12processEventE73 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1032
    _h4F53awt9Component17dispatchEventImplE162 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4p53awt9Container17dispatchEventImplE79 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1326
    _h4F43awt6Window17dispatchEventImplE99 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:1032
    _h4F43awt9Component13dispatchEventE161 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:950
    _h4V23awt10EventQueue17dispatchfnXXImplE23 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:881
    _h4p23awt12EventQueue$33runE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:709
    _h4p23awt12EventQueue$33runE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:709
    _h4FcIdj4AccessController12doPrivilegedE3 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:818
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4p23awt12EventQueue$43runE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:858
    _h4p23awt12EventQueue$43runE2 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:858
    _h4FcIdj4AccessController12doPrivilegedE3 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:818
    _h4FcIFQXProteceWdZDomain$JavaSha$ZAccessImpl23doIeS4aHtapcztYivilegeE1 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.js:907
    _h4V23awt10EventQueue13dispatchfnXWE21 https://cjrtnc.leaningtech.com/2.2/runtime/rt.jar.java.awt.js:881
    anonymous https://cjrtnc.leaningtech.com/2.2/loader.js line 218 > Function:5
    runContinuationStack https://cjrtnc.leaningtech.com/2.2/loader.js:489
    cheerpjSchedule https://cjrtnc.leaningtech.com/2.2/loader.js:1220
    (Async: EventHandlerNonNull)
    cheerpjSchedInit https://cjrtnc.leaningtech.com/2.2/loader.js:895
    cheerpjInitOnce https://cjrtnc.leaningtech.com/2.2/loader.js:919
    cheerpjInit https://cjrtnc.leaningtech.com/2.2/loader.js:2122
    <anonymous> http://localhost:8080/test.html:11
alexp-sssup commented 2 years ago

I cannot reproduce this problem, it works as expected for me. As a first step I recommend to not user jar.js files, they are only an optimization and CheerpJ can successfully run code without them.

As a followup step, make sure the paths to the jar files passed as --deps are correct. I am quite sure that the problem is just that logback-classic-1.2.10.jar was not actually used as a dependency while being required.