Slf4j simple provided on classpath

[kad-kordes]

Hi all,

Since 5.12, de Maven dependency org.slf4j:slf4j-simple is added to the classpath. When using this version in Spring Boot, it clashes with the default logback-classic bindings:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/[user]/.m2/repository/org/slf4j/slf4j-simple/1.7.36/slf4j-simple-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/[user]/.m2/repository/ch/qos/logback/logback-classic/1.2.11/logback-classic-1.2.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]
[main] INFO org.springframework.test.context.support.AbstractContextLoader - Could not detect default resource locations for test class []: no resource found for suffixes {-context.xml, Context.groovy}.
[main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener, org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener, org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.event.ApplicationEventsTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener, org.springframework.test.context.event.EventPublishingTestExecutionListener]
[main] INFO org.springframework.boot.test.context.SpringBootTestContextBootstrapper - Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@2eea88a1, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@7ac296f6, org.springframework.test.context.event.ApplicationEventsTestExecutionListener@7fd7a283, org.springframework.boot.test.mock.mockito.MockitoTestExecutionListener@22f59fa, org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@78fa769e, org.springframework.test.context.support.DirtiesContextTestExecutionListener@16612a51, org.springframework.test.context.transaction.TransactionalTestExecutionListener@54e041a4, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@2c78324b, org.springframework.test.context.event.EventPublishingTestExecutionListener@79defdc, org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener@18317edc, org.springframework.boot.test.autoconfigure.restdocs.RestDocsTestExecutionListener@4e0ae11f, org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerResetTestExecutionListener@238d68ff, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcPrintOnlyOnFailureTestExecutionListener@4b86805d, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverTestExecutionListener@5852c06f, org.springframework.boot.test.autoconfigure.webservices.client.MockWebServiceServerTestExecutionListener@4149c063]
[main] ERROR org.springframework.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@2eea88a1] to prepare test instance []

Please do not include a SLF4J binding with your library.

Thanks in advance, Stefan

[kad-kordes]

I see you already noticed this issue...

[dkocher]

Duplicate for #432.