Logging in TeaVM : Unexpected error occurred: java.lang.AssertionError: Variable used before definition:

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 Error optimizing program for method org.apache.commons.logging.LogFactory.createFactory(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/Object;:
var @factoryClass as factoryClass // 1
var @classLoader as classLoader // 2
var @logFactoryClass as logFactoryClass // 3
var @ex as ex // 18
var @e as e // 31
var @implementsLogFactory as implementsLogFactory // 50
var @msg as msg // 51
var @e_1 as e // 75
var @classLoader_1 as classLoader // 93
var @classLoader_2 as classLoader // 94
var @e_2 as e // 99
var @e_3 as e // 100
var @classLoader_3 as classLoader // 105
...
var @classLoader_9 as classLoader // 115
var @e_4 as e // 119
var @ex_1 as ex // 122
$0
    initClass org.apache.commons.logging.LogFactory
    goto $1
$1
  at 'org/apache/commons/logging/LogFactory.java' 1012
    nop
    @logFactoryClass := null
  at unknown location
    goto $35
$2
    @4 := phi @logFactoryClass from $35, @19 from $29, @32 from $25, @48 from $34
  at 'org/apache/commons/logging/LogFactory.java' 1142
    @5 := invokeStatic `org.apache.commons.logging.LogFactory.isDiagnosticsEnabled()Z`
    if @5 == 0 then goto $5 else goto $6
    catch java.lang.Exception goto $7
$3
  at 'org/apache/commons/logging/LogFactory.java' 1020
    @88 := new java.lang.NoSuchMethodError
    @89 := 'Method not found: java.lang.ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class;'
    invoke `java.lang.NoSuchMethodError.(Ljava/lang/String;)V` @88, @89
    throw @88
    catch java.lang.ClassNotFoundException goto $4
    catch java.lang.NoClassDefFoundError goto $33
    catch java.lang.ClassCastException goto $34
    catch java.lang.Exception goto $7
$4
    @ex := exception
    @19 := phi @logFactoryClass from $3, @17 from $3
  at 'org/apache/commons/logging/LogFactory.java' 1050
    nop
    @20 := field org.apache.commons.logging.LogFactory.thisClassLoader as `Ljava/lang/ClassLoader;`
    if @classLoader !==@20 then goto $29 else goto $30
    catch java.lang.Exception goto $7
$5
  at 'org/apache/commons/logging/LogFactory.java' 1146
    @6 := invokeStatic `java.lang.Class.forName(Ljava/lang/String;)Ljava/lang/Class;` @factoryClass
  at 'org/apache/commons/logging/LogFactory.java' 1147
    @7 := invoke `java.lang.Class.newInstance()Ljava/lang/Object;` @6
  at unknown location
    @133 := nullCheck @6
  at 'org/apache/commons/logging/LogFactory.java' 1147
    @8 := cast @7 to `Lorg/apache/commons/logging/LogFactory;`
  at unknown location
    goto $36
    catch java.lang.Exception goto $7
$6
  at 'org/apache/commons/logging/LogFactory.java' 1143
    @9 := new java.lang.StringBuffer
    invoke `java.lang.StringBuffer.()V` @9
    @10 := 'Unable to load factory class via classloader '
    @11 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @9, @10
    @12 := invokeStatic `org.apache.commons.logging.LogFactory.objectId(Ljava/lang/Object;)Ljava/lang/String;` @classLoader_9
    @13 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @11, @12
  at unknown location
    @134 := nullCheck @11
  at 'org/apache/commons/logging/LogFactory.java' 1143
    @14 := ' - trying the classloader associated with this LogFactory.'
    @15 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @13, @14
  at unknown location
    @135 := nullCheck @13
  at 'org/apache/commons/logging/LogFactory.java' 1143
    @16 := invoke `java.lang.StringBuffer.toString()Ljava/lang/String;` @15
  at unknown location
    @136 := nullCheck @15
  at 'org/apache/commons/logging/LogFactory.java' 1143
    invokeStatic `org.apache.commons.logging.LogFactory.logDiagnostic(Ljava/lang/String;)V` @16
  at unknown location
    goto $5
    catch java.lang.Exception goto $7
$7
    @e_1 := exception
    @76 := phi @logFactoryClass from $35, @4 from $2, @4 from $5, @133 from $5, @4 from $6, @logFactoryClass from $3, @17 from $3, @19 from $4, @19 from $29, @19 from $30, @19 from $31, @19 from $32, @32 from $33, @32 from $25, @32 from $26, @32 from $27, @32 from $28, @48 from $34, @48 from $16, @48 from $17, @48 from $18, @48 from $19, @48 from $20, @48 from $21, @48 from $22, @48 from $23, @48 from $24
  at 'org/apache/commons/logging/LogFactory.java' 1150
    nop
    @77 := invokeStatic `org.apache.commons.logging.LogFactory.isDiagnosticsEnabled()Z`
    if @77 == 0 then goto $8 else goto $9
$8
  at 'org/apache/commons/logging/LogFactory.java' 1153
    if @76 === null then goto $10 else goto $11
$9
  at 'org/apache/commons/logging/LogFactory.java' 1151
    @87 := 'Unable to create LogFactory instance.'
    invokeStatic `org.apache.commons.logging.LogFactory.logDiagnostic(Ljava/lang/String;)V` @87
  at unknown location
    goto $8
$10
  at 'org/apache/commons/logging/LogFactory.java' 1158
    @78 := new org.apache.commons.logging.LogConfigurationException
  at 'org/apache/commons/logging/LogConfigurationException.java' 55
    nop
    if @e_1 !== null then goto $37 else goto $38
$11
  at 'org/apache/commons/logging/LogFactory.java' 1153
    @79 := field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory as `Ljava/lang/Class;`
    if @79 !== null then goto $12 else goto $13
$12
  at 'org/apache/commons/logging/LogFactory.java' 1153
    @80 := field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory as `Ljava/lang/Class;`
  at unknown location
    goto $14
$13
  at 'org/apache/commons/logging/LogFactory.java' 1153
    @81 := 'org.apache.commons.logging.LogFactory'
    @82 := invokeStatic `org.apache.commons.logging.LogFactory.class$(Ljava/lang/String;)Ljava/lang/Class;` @81
    field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory := @82 as `Ljava/lang/Class;`
    goto $14
$14
    @83 := phi @80 from $12, @82 from $13
  at 'org/apache/commons/logging/LogFactory.java' 1153
    @84 := invoke `java.lang.Class.isAssignableFrom(Ljava/lang/Class;)Z` @83, @76
  at unknown location
    @83 := nullCheck @83
  at 'org/apache/commons/logging/LogFactory.java' 1153
    if @84 != 0 then goto $10 else goto $15
$15
  at 'org/apache/commons/logging/LogFactory.java' 1154
    @85 := new org.apache.commons.logging.LogConfigurationException
    @86 := 'The chosen LogFactory implementation does not extend LogFactory. Please check your configuration.'
    invoke `org.apache.commons.logging.LogConfigurationException.(Ljava/lang/String;Ljava/lang/Throwable;)V` @85, @86, @e_1
    return @85
$16
  at 'org/apache/commons/logging/LogFactory.java' 1077
    @implementsLogFactory := invokeStatic `org.apache.commons.logging.LogFactory.implementsLogFactory(Ljava/lang/Class;)Z` @48
  at 'org/apache/commons/logging/LogFactory.java' 1084
    nop
    @msg := new java.lang.StringBuffer
    invoke `java.lang.StringBuffer.()V` @msg
  at 'org/apache/commons/logging/LogFactory.java' 1085
    nop
    @52 := 'The application has specified that a custom LogFactory implementation '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @52
  at 'org/apache/commons/logging/LogFactory.java' 1086
    @53 := 'should be used but Class \''
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @53
  at 'org/apache/commons/logging/LogFactory.java' 1087
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @factoryClass
  at 'org/apache/commons/logging/LogFactory.java' 1088
    @54 := '\' cannot be converted to \''
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @54
  at 'org/apache/commons/logging/LogFactory.java' 1089
    @55 := field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory as `Ljava/lang/Class;`
    if @55 !== null then goto $17 else goto $18
    catch java.lang.Exception goto $7
$17
  at 'org/apache/commons/logging/LogFactory.java' 1089
    @56 := field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory as `Ljava/lang/Class;`
  at unknown location
    goto $19
    catch java.lang.Exception goto $7
$18
  at 'org/apache/commons/logging/LogFactory.java' 1089
    @57 := 'org.apache.commons.logging.LogFactory'
    @58 := invokeStatic `org.apache.commons.logging.LogFactory.class$(Ljava/lang/String;)Ljava/lang/Class;` @57
    field org.apache.commons.logging.LogFactory.class$org$apache$commons$logging$LogFactory := @58 as `Ljava/lang/Class;`
    goto $19
    catch java.lang.Exception goto $7
$19
    @59 := phi @56 from $17, @58 from $18
  at 'org/apache/commons/logging/LogFactory.java' 1089
    @60 := invoke `java.lang.Class.getName()Ljava/lang/String;` @59
  at unknown location
    @59 := nullCheck @59
  at 'org/apache/commons/logging/LogFactory.java' 1089
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @60
  at 'org/apache/commons/logging/LogFactory.java' 1090
    @61 := '\'. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @61
  at 'org/apache/commons/logging/LogFactory.java' 1091
    if @implementsLogFactory == 0 then goto $20 else goto $21
    catch java.lang.Exception goto $7
$20
  at 'org/apache/commons/logging/LogFactory.java' 1100
    @62 := 'Please check the custom implementation. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @62
  at unknown location
    goto $22
    catch java.lang.Exception goto $7
$21
  at 'org/apache/commons/logging/LogFactory.java' 1092
    @63 := 'The conflict is caused by the presence of multiple LogFactory classes '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @63
  at 'org/apache/commons/logging/LogFactory.java' 1093
    @64 := 'in incompatible classloaders. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @64
  at 'org/apache/commons/logging/LogFactory.java' 1094
    @65 := 'Background can be found in http://commons.apache.org/logging/tech.html. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @65
  at 'org/apache/commons/logging/LogFactory.java' 1095
    @66 := 'If you have not explicitly specified a custom LogFactory then it is likely '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @66
  at 'org/apache/commons/logging/LogFactory.java' 1096
    @67 := 'that the container has set one without your knowledge. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @67
  at 'org/apache/commons/logging/LogFactory.java' 1097
    @68 := 'In this case, consider using the commons-logging-adapters.jar file or '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @68
  at 'org/apache/commons/logging/LogFactory.java' 1098
    @69 := 'specifying the standard LogFactory from the command line. '
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @69
    goto $22
    catch java.lang.Exception goto $7
$22
  at 'org/apache/commons/logging/LogFactory.java' 1102
    @70 := 'Help can be found @http://commons.apache.org/logging/troubleshooting.html.'
    invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @msg, @70
  at 'org/apache/commons/logging/LogFactory.java' 1104
    @71 := invokeStatic `org.apache.commons.logging.LogFactory.isDiagnosticsEnabled()Z`
    if @71 == 0 then goto $23 else goto $24
    catch java.lang.Exception goto $7
$23
  at 'org/apache/commons/logging/LogFactory.java' 1108
    @72 := new java.lang.ClassCastException
    @73 := invoke `java.lang.StringBuffer.toString()Ljava/lang/String;` @msg
    invoke `java.lang.ClassCastException.(Ljava/lang/String;)V` @72, @73
    throw @72
    catch java.lang.Exception goto $7
$24
  at 'org/apache/commons/logging/LogFactory.java' 1105
    @74 := invoke `java.lang.StringBuffer.toString()Ljava/lang/String;` @msg
    invokeStatic `org.apache.commons.logging.LogFactory.logDiagnostic(Ljava/lang/String;)V` @74
  at unknown location
    goto $23
    catch java.lang.Exception goto $7
$25
  at 'org/apache/commons/logging/LogFactory.java' 1123
    goto $2
    catch java.lang.Exception goto $7
$26
  at 'org/apache/commons/logging/LogFactory.java' 1062
    @34 := invokeStatic `org.apache.commons.logging.LogFactory.isDiagnosticsEnabled()Z`
    if @34 == 0 then goto $27 else goto $28
    catch java.lang.Exception goto $7
$27
  at 'org/apache/commons/logging/LogFactory.java' 1067
    throw @e
    catch java.lang.Exception goto $7
$28
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @35 := new java.lang.StringBuffer
    invoke `java.lang.StringBuffer.()V` @35
    @36 := 'Class \''
    @37 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @35, @36
    @38 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @37, @factoryClass
  at unknown location
    @37 := nullCheck @37
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @39 := '\' cannot be loaded'
    @40 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @38, @39
  at unknown location
    @38 := nullCheck @38
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @41 := ' via classloader '
    @42 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @40, @41
  at unknown location
    @40 := nullCheck @40
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @43 := invokeStatic `org.apache.commons.logging.LogFactory.objectId(Ljava/lang/Object;)Ljava/lang/String;` @classLoader
    @44 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @42, @43
  at unknown location
    @42 := nullCheck @42
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @45 := ' - it depends on some other class that cannot be found.'
    @46 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @44, @45
  at unknown location
    @44 := nullCheck @44
  at 'org/apache/commons/logging/LogFactory.java' 1063
    @47 := invoke `java.lang.StringBuffer.toString()Ljava/lang/String;` @46
  at unknown location
    @46 := nullCheck @46
  at 'org/apache/commons/logging/LogFactory.java' 1063
    invokeStatic `org.apache.commons.logging.LogFactory.logDiagnostic(Ljava/lang/String;)V` @47
  at unknown location
    goto $27
    catch java.lang.Exception goto $7
$29
  at 'org/apache/commons/logging/LogFactory.java' 1123
    goto $2
    catch java.lang.Exception goto $7
$30
  at 'org/apache/commons/logging/LogFactory.java' 1052
    @21 := invokeStatic `org.apache.commons.logging.LogFactory.isDiagnosticsEnabled()Z`
    if @21 == 0 then goto $31 else goto $32
    catch java.lang.Exception goto $7
$31
  at 'org/apache/commons/logging/LogFactory.java' 1056
    throw @ex
    catch java.lang.Exception goto $7
$32
  at 'org/apache/commons/logging/LogFactory.java' 1053
    @22 := new java.lang.StringBuffer
    invoke `java.lang.StringBuffer.()V` @22
    @23 := 'Unable to locate any class called \''
    @24 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @22, @23
    @25 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @24, @factoryClass
  at unknown location
    @24 := nullCheck @24
  at 'org/apache/commons/logging/LogFactory.java' 1053
    @26 := '\' via classloader '
    @27 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @25, @26
  at unknown location
    @25 := nullCheck @25
  at 'org/apache/commons/logging/LogFactory.java' 1053
    @28 := invokeStatic `org.apache.commons.logging.LogFactory.objectId(Ljava/lang/Object;)Ljava/lang/String;` @classLoader
    @29 := invoke `java.lang.StringBuffer.append(Ljava/lang/String;)Ljava/lang/StringBuffer;` @27, @28
  at unknown location
    @27 := nullCheck @27
  at 'org/apache/commons/logging/LogFactory.java' 1053
    @30 := invoke `java.lang.StringBuffer.toString()Ljava/lang/String;` @29
  at unknown location
    @29 := nullCheck @29
  at 'org/apache/commons/logging/LogFactory.java' 1053
    invokeStatic `org.apache.commons.logging.LogFactory.logDiagnostic(Ljava/lang/String;)V` @30
  at unknown location
    goto $31
    catch java.lang.Exception goto $7
$33
    @e := exception
    @32 := phi @logFactoryClass from $3, @17 from $3
  at 'org/apache/commons/logging/LogFactory.java' 1060
    nop
    @33 := field org.apache.commons.logging.LogFactory.thisClassLoader as `Ljava/lang/ClassLoader;`
    if @classLoader !==@33 then goto $25 else goto $26
    catch java.lang.Exception goto $7
$34
    @48 := phi @logFactoryClass from $3, @17 from $3
  at 'org/apache/commons/logging/LogFactory.java' 1071
    nop
    @49 := field org.apache.commons.logging.LogFactory.thisClassLoader as `Ljava/lang/ClassLoader;`
    if @classLoader !==@49 then goto $2 else goto $16
    catch java.lang.Exception goto $7
$35
  at 'org/apache/commons/logging/LogFactory.java' 1014
    nop
    if @classLoader === null then goto $2 else goto $3
    catch java.lang.Exception goto $7
$36
  at 'org/apache/commons/logging/LogFactory.java' 1147
    return @8
$37
  at 'org/apache/commons/logging/LogConfigurationException.java' 55
    @90 := invokeVirtual `java.lang.Throwable.toString()Ljava/lang/String;` @e_1
  at unknown location
    goto $39
$38
  at 'org/apache/commons/logging/LogConfigurationException.java' 55
    @91 := null
    goto $39
$39
    @92 := phi @90 from $37, @91 from $38
  at 'org/apache/commons/logging/LogConfigurationException.java' 55
    invoke `org.apache.commons.logging.LogConfigurationException.(Ljava/lang/String;Ljava/lang/Throwable;)V` @78, @92, @e_1
  at 'org/apache/commons/logging/LogFactory.java' 1158
    return @78



Unexpected error occurred: java.lang.AssertionError: Variable used before definition: @17 at $3

This may happen if you have logger implementation like this:

pom:

Solution:

TeaVM has its own logging mechanism which logs not only on console, but also on browser Developer Console like javascript’s console.log() :

Make sure to remove any dependencies that depends on apache commons-logging (e.g. htmlunit ). To make sure run:

mvn dependency:tree

in project directory. This should display a list of all library dependencies throughout entire project like this:

Get rid of any dependency that relies on apache commons-logging as TeaVM has very little support of external libraries:

Add following dependencies for logging:

Also make sure to set javascript optimization level to SIMPLE instead of FULL which might cause longer build-time and unintended failed built msg, in pom.xml:

In java class:
Demo Code: Download

Running sample:

run: mvn clean package

open: target/teavm-logging-demo-1.0-SNAPSHOT/index.html in browser.

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