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Dropwizard: java.lang.IllegalStateException: unable to get log context

I have a project in which there are several modules. One of the modules, for example "main", has my class of service "MyService.class". Dropwizard has a core - dropwizard-core. I want this jar in more than one module, so I was thinking about keeping my dependency in the parent POM. While doing this, when I run my dropwizard utility file, I encounter an exception as follows:

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)

This project works fine if I put a dependency in the POM of the "main" module.

Dropwizard contacts the wrong registrar, and this is the reason for this exception. But this binding happens in the background, and I do not control it.

I also use the dependency tree for both scenarios.

Case 1: When the core dropwizard is in a child POM (main module):

 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] | | +- com.google.code.findbugs:jsr305:jar:3.0.1:compile<br> [INFO] | | \- joda-time:joda-time:jar:2.9:compile<br> [INFO] | +- io.dropwizard:dropwizard-jackson:jar:0.9.2:compile<br> [INFO] | | +- com.fasterxml.jackson.core:jackson-core:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.core:jackson-databind:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jdk7:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-guava:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.module:jackson-module-afterburner:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-joda:jar:2.6.3:compile<br> [INFO] | | +- org.slf4j:slf4j-api:jar:1.7.12:compile<br> [INFO] | | \- ch.qos.logback:logback-classic:jar:1.1.3:compile<br> [INFO] | +- io.dropwizard:dropwizard-validation:jar:0.9.2:compile<br> [INFO] | | +- org.hibernate:hibernate-validator:jar:5.2.2.Final:compile<br> [INFO] | | | +- javax.validation:validation-api:jar:1.1.0.Final:compile<br> [INFO] | | | +- org.jboss.logging:jboss-logging:jar:3.2.1.Final:compile<br> [INFO] | | | \- com.fasterxml:classmate:jar:1.1.0:compile<br> [INFO] | | \- org.glassfish:javax.el:jar:3.0.0:compile<br> [INFO] | +- io.dropwizard:dropwizard-configuration:jar:0.9.2:compile<br> [INFO] | | +- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.6.3:compile<br> [INFO] | | | \- org.yaml:snakeyaml:jar:1.15:compile<br> [INFO] | | \- org.apache.commons:commons-lang3:jar:3.4:compile<br> [INFO] | +- io.dropwizard:dropwizard-logging:jar:0.9.2:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-logback:jar:3.1.2:compile<br> [INFO] | | +- org.slf4j:jul-to-slf4j:jar:1.7.12:compile<br><br> [INFO] | | +- ch.qos.logback:logback-core:jar:1.1.3:compile<br> [INFO] | | +- org.slf4j:log4j-over-slf4j:jar:1.7.12:compile<br> [INFO] | | +- org.slf4j:jcl-over-slf4j:jar:1.7.12:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-util:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-metrics:jar:0.9.2:compile<br> [INFO] | +- io.dropwizard:dropwizard-jersey:jar:0.9.2:compile<br> [INFO] | | +- org.glassfish.jersey.core:jersey-server:jar:2.22.1:compile<br> [INFO] | | | +- org.glassfish.jersey.core:jersey-common:jar:2.22.1:compile<br> [INFO] | | | | +- org.glassfish.jersey.bundles.repackaged:jersey-guava:jar:2.22.1:compile<br> [INFO] | | | | \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.1:compile<br> [INFO] | | | +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:compile<br> [INFO] | | | +- org.glassfish.jersey.media:jersey-media-jaxb:jar:2.22.1:compile<br> [INFO] | | | +- javax.annotation:javax.annotation-api:jar:1.2:compile<br> [INFO] | | | +- org.glassfish.hk2:hk2-api:jar:2.4.0-b31:compile<br> [INFO] | | | | +- org.glassfish.hk2:hk2-utils:jar:2.4.0-b31:compile<br> [INFO] | | | | \- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.4.0-b31:compile<br> [INFO] | | | +- org.glassfish.hk2.external:javax.inject:jar:2.4.0-b31:compile<br> [INFO] | | | \- org.glassfish.hk2:hk2-locator:jar:2.4.0-b31:compile<br> [INFO] | | | \- org.javassist:javassist:jar:3.18.1-GA:compile<br> [INFO] | | +- org.glassfish.jersey.ext:jersey-metainf-services:jar:2.22.1:compile<br> [INFO] | | +- org.glassfish.jersey.ext:jersey-bean-validation:jar:2.22.1:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-jersey2:jar:3.1.2:compile<br> [INFO] | | +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:jar:2.6.3:compile<br> [INFO] | | | +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-base:jar:2.6.3:compile<br> [INFO] | | | \- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.6.3:compile<br> [INFO] | | +- org.glassfish.jersey.containers:jersey-container-servlet:jar:2.22.1:compile<br> [INFO] | | | \- org.glassfish.jersey.containers:jersey-container-servlet-core:jar:2.22.1:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-server:jar:9.2.13.v20150730:compile<br> [INFO] | | | +- javax.servlet:javax.servlet-api:jar:3.1.0:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-io:jar:9.2.13.v20150730:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-webapp:jar:9.2.13.v20150730:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-xml:jar:9.2.13.v20150730:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-continuation:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-servlets:jar:0.9.2:compile<br> [INFO] | | \- io.dropwizard.metrics:metrics-annotation:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard:dropwizard-jetty:jar:0.9.2:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-jetty9:jar:3.1.2:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-servlet:jar:9.2.13.v20150730:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-security:jar:9.2.13.v20150730:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-servlets:jar:9.2.13.v20150730:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-http:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-lifecycle:jar:0.9.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-core:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-jvm:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-servlets:jar:3.1.2:compile<br> [INFO] | | \- io.dropwizard.metrics:metrics-json:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-healthchecks:jar:3.1.2:compile<br> [INFO] | +- net.sourceforge.argparse4j:argparse4j:jar:0.6.0:compile<br> [INFO] | \- org.eclipse.jetty.toolchain.setuid:jetty-setuid-java:jar:1.0.3:compile<br> [INFO] +- de.thomaskrille:dropwizard-template-config:jar:1.1.0:compile<br> [INFO] +- my.groupId.myProject:myProject-module1:jar:1.0-SNAPSHOT:compile<br> [INFO] +- my.groupId.myProject:myProject-module2:jar:1.0-SNAPSHOT:compile<br> [INFO] +- my.groupId.myProject:myProject-module3:jar:0.0.1-SNAPSHOT:compile<br> [INFO] | +- io.dropwizard:dropwizard-auth:jar:0.9.1:compile<br> [INFO] | \- io.dropwizard:dropwizard-client:jar:0.9.1:compile<br> [INFO] | +- org.glassfish.jersey.core:jersey-client:jar:2.22.1:compile<br> [INFO] | +- org.apache.httpcomponents:httpclient:jar:4.5.1:compile<br> [INFO] | | +- org.apache.httpcomponents:httpcore:jar:4.4.3:compile<br> [INFO] | | \- commons-codec:commons-codec:jar:1.9:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-httpclient:jar:3.1.2:compile<br> [INFO] | \- org.glassfish.jersey.connectors:jersey-apache-connector:jar:2.22.1:compile<br> [INFO] +- junit:junit:jar:4.12:test<br> [INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:test<br> [INFO] +- org.hamcrest:hamcrest-library:jar:1.3:test<br> [INFO] \- org.mockito:mockito-core:jar:1.10.19:test<br> [INFO] \- org.objenesis:objenesis:jar:2.1:test<br> **Case 2 : When dropwizard-core is in parent POM :** my.groupId.myProject:myProject-main:jar:jar:1.0-SNAPSHOT<br> [INFO] +- de.thomaskrille:dropwizard-template-config:jar:1.1.0:compile<br> [INFO] +- my.groupId.myProject:myProject-module1:jar:1.0-SNAPSHOT:compile<br> [INFO] +- my.groupId.myProject:myProject-module2:jar:1.0-SNAPSHOT:compile<br> [INFO] +- my.groupId.myProject:myProject-common:jar:0.0.1-SNAPSHOT:compile<br> [INFO] | +- io.dropwizard:dropwizard-auth:jar:0.9.1:compile<br> [INFO] | \- io.dropwizard:dropwizard-client:jar:0.9.1:compile<br> [INFO] | +- org.glassfish.jersey.core:jersey-client:jar:2.22.1:compile<br> [INFO] | | +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:compile<br> [INFO] | | +- org.glassfish.jersey.core:jersey-common:jar:2.22.1:compile<br> [INFO] | | | +- org.glassfish.jersey.bundles.repackaged:jersey-guava:jar:2.22.1:compile<br> [INFO] | | | \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.1:compile<br> [INFO] | | +- org.glassfish.hk2:hk2-api:jar:2.4.0-b31:compile<br> [INFO] | | | +- org.glassfish.hk2:hk2-utils:jar:2.4.0-b31:compile<br> [INFO] | | | \- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.4.0-b31:compile<br> [INFO] | | +- org.glassfish.hk2.external:javax.inject:jar:2.4.0-b31:compile<br> [INFO] | | \- org.glassfish.hk2:hk2-locator:jar:2.4.0-b31:compile<br> [INFO] | | \- org.javassist:javassist:jar:3.18.1-GA:compile<br> [INFO] | +- org.apache.httpcomponents:httpclient:jar:4.5.1:compile<br> [INFO] | | +- org.apache.httpcomponents:httpcore:jar:4.4.3:compile<br> [INFO] | | \- commons-codec:commons-codec:jar:1.9:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-httpclient:jar:3.1.2:compile<br> [INFO] | \- org.glassfish.jersey.connectors:jersey-apache-connector:jar:2.22.1:compile<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] | | +- com.google.code.findbugs:jsr305:jar:3.0.1:compile<br> [INFO] | | \- joda-time:joda-time:jar:2.9:compile<br> [INFO] | +- io.dropwizard:dropwizard-jackson:jar:0.9.2:compile<br> [INFO] | | +- com.fasterxml.jackson.core:jackson-core:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.core:jackson-databind:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jdk7:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-guava:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.module:jackson-module-afterburner:jar:2.6.3:compile<br> [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-joda:jar:2.6.3:compile<br> [INFO] | | +- org.slf4j:slf4j-api:jar:1.7.12:compile<br> [INFO] | | \- ch.qos.logback:logback-classic:jar:1.1.3:compile<br> [INFO] | +- io.dropwizard:dropwizard-validation:jar:0.9.2:compile<br> [INFO] | | +- org.hibernate:hibernate-validator:jar:5.2.2.Final:compile<br> [INFO] | | | +- javax.validation:validation-api:jar:1.1.0.Final:compile<br> [INFO] | | | +- org.jboss.logging:jboss-logging:jar:3.2.1.Final:compile<br> [INFO] | | | \- com.fasterxml:classmate:jar:1.1.0:compile<br> [INFO] | | \- org.glassfish:javax.el:jar:3.0.0:compile<br> [INFO] | +- io.dropwizard:dropwizard-configuration:jar:0.9.2:compile<br> [INFO] | | +- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.6.3:compile<br> [INFO] | | | \- org.yaml:snakeyaml:jar:1.15:compile<br> [INFO] | | \- org.apache.commons:commons-lang3:jar:3.4:compile<br> [INFO] | +- io.dropwizard:dropwizard-logging:jar:0.9.2:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-logback:jar:3.1.2:compile<br> [INFO] | | +- org.slf4j:jul-to-slf4j:jar:1.7.12:compile<br> [INFO] | | +- ch.qos.logback:logback-core:jar:1.1.3:compile<br> [INFO] | | +- org.slf4j:log4j-over-slf4j:jar:1.7.12:compile<br> [INFO] | | +- org.slf4j:jcl-over-slf4j:jar:1.7.12:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-util:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-metrics:jar:0.9.2:compile<br> [INFO] | +- io.dropwizard:dropwizard-jersey:jar:0.9.2:compile<br> [INFO] | | +- org.glassfish.jersey.core:jersey-server:jar:2.22.1:compile<br> [INFO] | | | +- org.glassfish.jersey.media:jersey-media-jaxb:jar:2.22.1:compile<br> [INFO] | | | \- javax.annotation:javax.annotation-api:jar:1.2:compile<br> [INFO] | | +- org.glassfish.jersey.ext:jersey-metainf-services:jar:2.22.1:compile<br> [INFO] | | +- org.glassfish.jersey.ext:jersey-bean-validation:jar:2.22.1:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-jersey2:jar:3.1.2:compile<br> [INFO] | | +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:jar:2.6.3:compile<br> [INFO] | | | +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-base:jar:2.6.3:compile<br> [INFO] | | | \- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.6.3:compile<br> [INFO] | | +- org.glassfish.jersey.containers:jersey-container-servlet:jar:2.22.1:compile<br> [INFO] | | | \- org.glassfish.jersey.containers:jersey-container-servlet-core:jar:2.22.1:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-server:jar:9.2.13.v20150730:compile<br> [INFO] | | | +- javax.servlet:javax.servlet-api:jar:3.1.0:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-io:jar:9.2.13.v20150730:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-webapp:jar:9.2.13.v20150730:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-xml:jar:9.2.13.v20150730:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-continuation:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-servlets:jar:0.9.2:compile<br> [INFO] | | \- io.dropwizard.metrics:metrics-annotation:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard:dropwizard-jetty:jar:0.9.2:compile<br> [INFO] | | +- io.dropwizard.metrics:metrics-jetty9:jar:3.1.2:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-servlet:jar:9.2.13.v20150730:compile<br> [INFO] | | | \- org.eclipse.jetty:jetty-security:jar:9.2.13.v20150730:compile<br> [INFO] | | +- org.eclipse.jetty:jetty-servlets:jar:9.2.13.v20150730:compile<br> [INFO] | | \- org.eclipse.jetty:jetty-http:jar:9.2.13.v20150730:compile<br> [INFO] | +- io.dropwizard:dropwizard-lifecycle:jar:0.9.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-core:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-jvm:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-servlets:jar:3.1.2:compile<br> [INFO] | | \- io.dropwizard.metrics:metrics-json:jar:3.1.2:compile<br> [INFO] | +- io.dropwizard.metrics:metrics-healthchecks:jar:3.1.2:compile<br> [INFO] | +- net.sourceforge.argparse4j:argparse4j:jar:0.6.0:compile<br> [INFO] | \- org.eclipse.jetty.toolchain.setuid:jetty-setuid-java:jar:1.0.3:compile<br> [INFO] +- junit:junit:jar:4.12:test<br> [INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:test<br> [INFO] +- org.hamcrest:hamcrest-library:jar:1.3:test<br> [INFO] \- org.mockito:mockito-core:jar:1.10.19:test<br> [INFO] \- org.objenesis:objenesis:jar:2.1:test<br>

If anyone can come up with possible reasoning, it will be very helpful.

Thanks.

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2 answers

Your problem is that you have two different implementations of slf4j (or bindings) in your classpath, and this should not be the case.

When this happens, the first (in order of appearance in the classpath) uses slf4j. Then the dropwizard LoggingUtil tries to retrieve the actual ILoggerFactory , but expects it to be a LoggerContext callback LoggerContext .

In your case, this is an instance of SimpleLoggerFactory , because slf4j-simple appears first in the classpath when you declare a dropwizard-core dependency in the parent POM: indeed, the logback-classic dependency is created by dropwizard-core .

The solution is very simple: you must remove the dependency on slf4j-simple .

This is explained at the very beginning of the slf4j manual .

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This problem is solved for me after I completely excluded jar slf4j-log4j12 by adding below to my build.gradle

 configurations.all { exclude group:"org.slf4j", module: "slf4j-log4j12" }
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