我有一个项目,里面有多个模块.其中一个模块,比如说"main",就是我的服务类"MyService.class".Dropwizard有一个jar - dropwizard-core.我想在多个模块中使用这个jar,所以我想在父POM中保持它的依赖性.通过这样做,在运行我的dropwizard服务文件时,我遇到如下异常:
SLF4J: Class path contains multiple SLF4J bindings.<br>
SLF4J: Found binding in [jar:file:/home/username/.m2/repository/org/slf4j/slf4j-simple/1.7.12/slf4j-simple-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]<br>
SLF4J: Found binding in [jar:file:/home/username/.m2/repository/ch/qos/logback/logback-classic/1.1.3/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]<br>
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.<br>
SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]<br><br>
Exception in thread "main" java.lang.IllegalStateException: Unable to acquire the logger context
at io.dropwizard.logging.LoggingUtil.getLoggerContext(LoggingUtil.java:46)
at io.dropwizard.logging.BootstrapLogging.bootstrap(BootstrapLogging.java:45)
at io.dropwizard.logging.BootstrapLogging.bootstrap(BootstrapLogging.java:34)
at io.dropwizard.Application.<init>(Application.java:24)
at my.project.package.MyService.<init>(MyService.java:31)
at my.project.package.MyService.main(MyService.java:38)
如果我将依赖项放在"main"模块的POM中,那么这个项目运行得很好.
Dropwizard与错误的记录器绑定,这就是这个异常背后的原因.但这种绑定发生在后台,我无法控制它.
我也在为这两个场景共享依赖树.
案例1:当dropwizard-core在子POM(主模块)中时:
my.groupId.myProject:myProject-main:jar:1.0-SNAPSHOT<br>
[INFO] +- io.dropwizard:dropwizard-core:jar:0.9.2:compile<br>
[INFO] | +- io.dropwizard:dropwizard-util:jar:0.9.2:compile<br>
[INFO] | | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.6.0:compile<br>
[INFO] | | +- com.google.guava:guava:jar:18.0:compile<br>
[INFO] | …