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Date: Tue, 11 Apr 2017 12:32:41 +0000 (UTC)
From: =?utf-8?Q?Mikael_St=C3=A5ldal_=28JIRA=29?= <jira@apache.org>
To: log4j-dev@logging.apache.org
Message-ID: <JIRA.13063179.1491913559000.255993.1491913961549@Atlassian.JIRA>
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References: <JIRA.13063179.1491913559000@Atlassian.JIRA> <JIRA.13063179.1491913559625@jira-lw-us.apache.org>
Subject: [jira] [Commented] (LOG4J2-1876) Unreliable checking for runtime
 dependencies
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archived-at: Tue, 11 Apr 2017 12:32:47 -0000


    [ https://issues.apache.org/jira/browse/LOG4J2-1876?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D159=
64296#comment-15964296 ]=20

Mikael St=C3=A5ldal commented on LOG4J2-1876:
----------------------------------------

I think this can be fixed by changing LoaderUtil.isClassAvailable like this=
:

{code}
    public static boolean isClassAvailable(final String className) {
        try {
            final Class<?> clazz =3D loadClass(className);
            return clazz !=3D null;
        } catch (final ClassNotFoundException | LinkageError e) {
            return false;
        } catch (final Throwable e) {
            LowLevelLogUtil.logException("Unknown error checking for existe=
nce of class: " + className, e);
            return false;
        }
    }
{code}

What do you think.

> Unreliable checking for runtime dependencies
> --------------------------------------------
>
>                 Key: LOG4J2-1876
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1876
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.8.2
>            Reporter: Mikael St=C3=A5ldal
>            Assignee: Mikael St=C3=A5ldal
>
> If I include this in Maven POM:
> {code}
> <dependency>
>     <groupId>com.fasterxml.jackson.core</groupId>
>     <artifactId>jackson-databind</artifactId>
>     <version>2.8.7</version>
>     <scope>runtime</scope>
>     <exclusions>
>         <exclusion>
>             <groupId>com.fasterxml.jackson.core</groupId>
>             <artifactId>jackson-core</artifactId>
>         </exclusion>
>     </exclusions>
> </dependency>
> {code}
> I get this printed on STDERR on startup:
> {code}
> Unknown error checking for existence of class: com.fasterxml.jackson.data=
bind.ObjectMapper
> java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/Versioned
> =09at java.lang.ClassLoader.defineClass1(Native Method)
> =09at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
> =09at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:=
142)
> =09at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
> =09at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
> =09at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
> =09at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
> =09at java.security.AccessController.doPrivileged(Native Method)
> =09at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> =09at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> =09at java.lang.Class.forName0(Native Method)
> =09at java.lang.Class.forName(Class.java:264)
> =09at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:=
141)
> =09at org.apache.logging.log4j.util.LoaderUtil.isClassAvailable(LoaderUti=
l.java:115)
> =09at org.apache.logging.log4j.core.util.Loader.isClassAvailable(Loader.j=
ava:310)
> =09at org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory.=
<init>(YamlConfigurationFactory.java:47)
> =09at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Metho=
d)
> =09at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstru=
ctorAccessorImpl.java:62)
> =09at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Delegatin=
gConstructorAccessorImpl.java:45)
> =09at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> =09at org.apache.logging.log4j.core.util.ReflectionUtil.instantiate(Refle=
ctionUtil.java:188)
> =09at org.apache.logging.log4j.core.config.ConfigurationFactory.addFactor=
y(ConfigurationFactory.java:190)
> =09at org.apache.logging.log4j.core.config.ConfigurationFactory.getInstan=
ce(ConfigurationFactory.java:164)
> =09at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerConte=
xt.java:613)
> =09at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerConte=
xt.java:634)
> =09at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.jav=
a:229)
> =09at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(L=
og4jContextFactory.java:242)
> =09at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(L=
og4jContextFactory.java:45)
> =09at org.apache.logging.log4j.LogManager.getContext(LogManager.java:174)
> =09at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:618)
> =09at logtest.Main.<clinit>(Main.java:14)
> Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.V=
ersioned
> =09at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> =09at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> =09... 33 more
> Unknown error checking for existence of class: com.fasterxml.jackson.data=
bind.ObjectMapper
> java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/Versioned
> =09at java.lang.ClassLoader.defineClass1(Native Method)
> =09at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
> =09at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:=
142)
> =09at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
> =09at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
> =09at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
> =09at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
> =09at java.security.AccessController.doPrivileged(Native Method)
> =09at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> =09at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> =09at java.lang.Class.forName0(Native Method)
> =09at java.lang.Class.forName(Class.java:264)
> =09at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:=
141)
> =09at org.apache.logging.log4j.util.LoaderUtil.isClassAvailable(LoaderUti=
l.java:115)
> =09at org.apache.logging.log4j.core.util.Loader.isClassAvailable(Loader.j=
ava:310)
> =09at org.apache.logging.log4j.core.config.json.JsonConfigurationFactory.=
<init>(JsonConfigurationFactory.java:49)
> =09at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Metho=
d)
> =09at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstru=
ctorAccessorImpl.java:62)
> =09at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Delegatin=
gConstructorAccessorImpl.java:45)
> =09at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> =09at org.apache.logging.log4j.core.util.ReflectionUtil.instantiate(Refle=
ctionUtil.java:188)
> =09at org.apache.logging.log4j.core.config.ConfigurationFactory.addFactor=
y(ConfigurationFactory.java:190)
> =09at org.apache.logging.log4j.core.config.ConfigurationFactory.getInstan=
ce(ConfigurationFactory.java:164)
> =09at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerConte=
xt.java:613)
> =09at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerConte=
xt.java:634)
> =09at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.jav=
a:229)
> =09at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(L=
og4jContextFactory.java:242)
> =09at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(L=
og4jContextFactory.java:45)
> =09at org.apache.logging.log4j.LogManager.getContext(LogManager.java:174)
> =09at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:618)
> =09at logtest.Main.<clinit>(Main.java:14)
> Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.V=
ersioned
> =09at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> =09at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> =09at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> =09... 33 more
> {code}


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