logback配置不生效的问题

用tomcat/jetty启动一个war工程，配置了logback.xml，并没有日志打印出来。

解决思路：
1、修改了logback.xml，添加几个乱七八糟的字符串进去，启动依然可以成功。说明是logback.xml文件根本就没有读取。
2、发现启动时有警告：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/F:/Tools/maven3.1.1/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/F:/Tools/maven3.1.1/repository/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]

原来是因为有StaticLoggerBinder这个类有冲突的依赖。

3、在工程中根路径，执行mvn dependency:tree 找到这两个jar包引入的原因，删掉一个即可。

我这次遇到的问题是我本地用的logback-classic-1.1.7.jar，并且强依赖该版本，通过步骤3的命令执行后发现hbase有对slf4j-log4j12的依赖，于是在引入hbase时添加exclusion即可。

com.kxd.skyeye:skyeye-sample:war:1.0.0-SNAPSHOT
+- javax.servlet:servlet-api:jar:2.5:provided
+- com.alibaba:dubbo:jar:2.5.4:compile
|  +- org.springframework:spring-web:jar:4.3.10.RELEASE:compile
|  +- org.javassist:javassist:jar:3.20.0-GA:compile
|  \- org.jboss.netty:netty:jar:3.2.5.Final:compile
+- org.springframework:spring-core:jar:4.3.10.RELEASE:compile
|  \- commons-logging:commons-logging:jar:1.2:compile
+- org.springframework:spring-beans:jar:4.3.10.RELEASE:compile
+- org.springframework:spring-context:jar:4.3.10.RELEASE:compile
|  +- org.springframework:spring-aop:jar:4.3.10.RELEASE:compile
|  \- org.springframework:spring-expression:jar:4.3.10.RELEASE:compile
+- com.alibaba:fastjson:jar:1.1.37:compile
+- org.slf4j:slf4j-api:jar:1.6.0:compile
+- redis.clients:jedis:jar:2.4.2:compile
|  \- org.apache.commons:commons-pool2:jar:2.0:compile
+- com.kxd.skyeye:skyeye-interceptor:jar:1.0.0-SNAPSHOT:compile
|  +- com.kxd.skyeye:skyeye-core:jar:1.0.0-SNAPSHOT:compile
|  +- org.aspectj:aspectjrt:jar:1.6.11:compile
|  +- org.aspectj:aspectjweaver:jar:1.6.11:compile
|  \- cglib:cglib-nodep:jar:2.2:compile
+- com.kxd.skyeye:skyeye-common:jar:1.0.0-SNAPSHOT:compile
|  \- org.apache.hbase:hbase-client:jar:1.2.0:compile
|     +- org.apache.hbase:hbase-annotations:jar:1.2.0:compile
|     |  \- log4j:log4j:jar:1.2.17:compile
|     +- org.apache.hbase:hbase-common:jar:1.2.0:compile
|     |  +- commons-collections:commons-collections:jar:3.2.2:compile
|     |  \- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
|     +- org.apache.hbase:hbase-protocol:jar:1.2.0:compile
|     +- commons-codec:commons-codec:jar:1.9:compile
|     +- commons-io:commons-io:jar:2.4:compile
|     +- commons-lang:commons-lang:jar:2.6:compile
|     +- com.google.guava:guava:jar:12.0.1:compile
|     |  \- com.google.code.findbugs:jsr305:jar:1.3.9:compile
|     +- com.google.protobuf:protobuf-java:jar:2.5.0:compile
|     +- io.netty:netty-all:jar:4.0.23.Final:compile
|     +- org.apache.zookeeper:zookeeper:jar:3.4.6:compile
|     |  \- org.slf4j:slf4j-log4j12:jar:1.6.1:compile
|     +- org.apache.htrace:htrace-core:jar:3.1.0-incubating:compile
|     +- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13:compile
|     |  \- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile
|     +- org.jruby.jcodings:jcodings:jar:1.0.8:compile
|     +- org.jruby.joni:joni:jar:2.1.2:compile
|     +- com.yammer.metrics:metrics-core:jar:2.2.0:compile
|     +- org.apache.hadoop:hadoop-auth:jar:2.5.1:compile
|     |  +- org.apache.httpcomponents:httpclient:jar:4.2.5:compile
|     |  |  \- org.apache.httpcomponents:httpcore:jar:4.2.4:compile
|     |  \- org.apache.directory.server:apacheds-kerberos-codec:jar:2.0.0-M15:compile
|     |     +- org.apache.directory.server:apacheds-i18n:jar:2.0.0-M15:compile
|     |     +- org.apache.directory.api:api-asn1-api:jar:1.0.0-M20:compile
|     |     \- org.apache.directory.api:api-util:jar:1.0.0-M20:compile
|     +- org.apache.hadoop:hadoop-common:jar:2.5.1:compile
|     |  +- org.apache.hadoop:hadoop-annotations:jar:2.5.1:compile
|     |  |  \- jdk.tools:jdk.tools:jar:1.6:system
|     |  +- commons-cli:commons-cli:jar:1.2:compile
|     |  +- org.apache.commons:commons-math3:jar:3.1.1:compile
|     |  +- xmlenc:xmlenc:jar:0.52:compile
|     |  +- commons-httpclient:commons-httpclient:jar:3.1:compile
|     |  +- commons-net:commons-net:jar:3.1:compile
|     |  +- commons-el:commons-el:jar:1.0:runtime
|     |  +- commons-configuration:commons-configuration:jar:1.6:compile
|     |  |  +- commons-digester:commons-digester:jar:1.8:compile
|     |  |  |  \- commons-beanutils:commons-beanutils:jar:1.7.0:compile
|     |  |  \- commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
|     |  +- org.apache.avro:avro:jar:1.7.4:compile
|     |  |  \- com.thoughtworks.paranamer:paranamer:jar:2.3:compile
|     |  +- com.jcraft:jsch:jar:0.1.42:compile
|     |  \- org.apache.commons:commons-compress:jar:1.4.1:compile
|     |     \- org.tukaani:xz:jar:1.0:compile
|     +- org.apache.hadoop:hadoop-mapreduce-client-core:jar:2.5.1:compile
|     |  +- org.apache.hadoop:hadoop-yarn-common:jar:2.5.1:compile
|     |  |  +- org.apache.hadoop:hadoop-yarn-api:jar:2.5.1:compile
|     |  |  \- javax.xml.bind:jaxb-api:jar:2.2.2:compile
|     |  |     +- javax.xml.stream:stax-api:jar:1.0-2:compile
|     |  |     \- javax.activation:activation:jar:1.1:compile
|     |  \- io.netty:netty:jar:3.6.2.Final:compile
|     +- com.github.stephenc.findbugs:findbugs-annotations:jar:1.3.9-1:compile
|     \- junit:junit:jar:4.8.1:test
+- org.apache.commons:commons-lang3:jar:3.1:compile
+- org.springframework:spring-webmvc:jar:4.3.10.RELEASE:compile
+- com.github.danielwegener:logback-kafka-appender:jar:0.1.0:runtime
+- org.apache.kafka:kafka-clients:jar:0.10.0.1:compile
|  +- net.jpountz.lz4:lz4:jar:1.3.0:compile
|  \- org.xerial.snappy:snappy-java:jar:1.1.2.6:compile
+- ch.qos.logback:logback-classic:jar:1.1.7:compile
\- ch.qos.logback:logback-core:jar:1.1.7:compile