java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log
dependency:treeis a usefull tool that's true.
In addition, another way to fix it:
while using Eclipse IDE, use SHIFT + CTRL + T to open following type "SLF4JLocationAwareLog"
You should be able to find related library and so a potential conflict.
Switch to the dependency tree view of the pom.xml to know the exclusion to add.
In my case, was related to struts dependency jcl104-over-slf4j. I just exclude this one from the dependency:
<dependency>
<groupId>displaytag</groupId>
<artifactId>displaytag</artifactId>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>jcl104-over-slf4j</artifactId>
</exclusion>
</exclusions>
</dependency>
I had the same problem when writing test cases while doing code refactoring in a Java 7 project. I fixed it by replacing the old logging imports by slf4j loggers
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
in addition to it my pom dependencies looked like-
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc-struts</artifactId>
<version>2.5.6</version>
<exclusions>
<exclusion>
<groupId>struts</groupId>
<artifactId>struts</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate</artifactId>
<version>3.2.6.ga</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts-core</artifactId>
<version>1.3.9</version>
<exclusions>
<exclusion>
<groupId>antlr</groupId>
<artifactId>antlr</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts-taglib</artifactId>
<version>1.3.9</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts-tiles</artifactId>
<version>1.3.9</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts-extras</artifactId>
<version>1.3.9</version>
</dependency>
<dependency>
<groupId>axis</groupId>
<artifactId>axis</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6</version>
</dependency>
<dependency>
<groupId>velocity-tools</groupId>
<artifactId>velocity-tools</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>displaytag</groupId>
<artifactId>displaytag</artifactId>
<version>1.2.0-gema-2</version>
<exclusions>
<exclusion>
<groupId>struts</groupId>
<artifactId>struts</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</exclusion>
<exclusion>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
</exclusion>
<exclusion>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
</exclusion>
<exclusion>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
</exclusion>
<exclusion>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
</exclusion>
<exclusion>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts-el</artifactId>
<version>1.3.9</version>
</dependency>
<dependency>
<groupId>struts</groupId>
<artifactId>struts-layout-wrapper</artifactId>
<version>1.2.19</version>
<exclusions>
<exclusion>
<groupId>struts</groupId>
<artifactId>struts</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>1.4.8</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
<version>1.8</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>de.gema.sso</groupId>
<artifactId>gema-sso-client</artifactId>
<version>1.2</version>
<exclusions>
<exclusion>
<groupId>struts</groupId>
<artifactId>struts</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--test -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>2.5.6</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.4.4</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<filters>
<filter>${basedir}/target/filter.properties</filter>
</filters>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.3</version>
<executions>
<execution>
<phase>generate-resources</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<!-- Safety -->
<mkdir dir="${project.build.directory}" />
<tstamp>
<format property="build.time" pattern="yyyy-MM-dd hh:mm:ss" />
</tstamp>
<tstamp>
<format property="build.nr" pattern="yyyyMMddhhmmss" />
</tstamp>
<echo file="${basedir}/target/filter.properties">
buildNr=${build.nr}
buildTime=${build.time}
</echo>
</tasks>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<extensions>
<extension>
<groupId>fr.jcgay.maven.extension</groupId>
<artifactId>unique-revision-maven-filtering</artifactId>
<version>1.0</version>
</extension>
</extensions>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</dependency>
Use mvn dependency:tree to see which version of slf4j maven decides to give you. If it has picked the wrong version, you could use a dependency management section to specify which version you want.
If the output of dependency:tree shows the correct version (i.e. a version which does contain the method it can't find), then add -verbose:class as a jvm argument to see where it is loading that class from (e.g. if deploying in jboss it might be loading it from its internal logging jars instead of your slf4j jars).
I had the same problem in a Gradle project.
The answers given here were useful. I just had to solve it in a Gradle way.
Here is my solution:
configurations.all {
all*.exclude group: 'org.slf4j', module: 'jcl104-over-slf4j'
}