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Home/ Questions/How to solve the problem: failed to start bean 'documentationpluginsbootstrapper'?
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Richie Weber
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Richie Weber
Asked: July 5, 20222022-07-05T08:25:15+00:00 2022-07-05T08:25:15+00:00In: Error

How to solve the problem: failed to start bean ‘documentationpluginsbootstrapper’?

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Hello everyone, I describe my error as follows.

Springfox is included into the SpringBoot project. The application fails to launch after upgrading to SpringBoot 2.6.0 and raises an exception: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException.

The following is the exception stack.

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-12-23 16:52:35.735 ERROR 15348 --- [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181)
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54)
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356)
at org.springframework.context.support.DefaultLifecycleProcessor$$Lambda$778/18341126.accept(Unknown Source)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155)
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:302)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290)
at com.chqiuu.test.TestApplication.main(TestApplication.java:23)
Caused by: java.lang.NullPointerException: null
at springfox.documentation.spring.web.WebMvcPatternsRequestConditionWrapper.getPatterns(WebMvcPatternsRequestConditionWrapper.java:56)
at springfox.documentation.RequestHandler.sortedPaths(RequestHandler.java:113)
at springfox.documentation.spi.service.contexts.Orderings.lambda$byPatternsCondition$3(Orderings.java:89)
at springfox.documentation.spi.service.contexts.Orderings$$Lambda$796/7205235.apply(Unknown Source)
at java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469)
at java.util.Comparator$$Lambda$68/3330950.compare(Unknown Source)
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:351)
at java.util.TimSort.sort(TimSort.java:230)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.ArrayList.sort(ArrayList.java:1454)
at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider.requestHandlers(WebMvcRequestHandlerProvider.java:81)
at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper$$Lambda$790/3038834.apply(Unknown Source)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.withDefaults(AbstractDocumentationPluginsBootstrapper.java:107)
at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.buildContext(AbstractDocumentationPluginsBootstrapper.java:91)
at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.bootstrapDocumentationPlugins(AbstractDocumentationPluginsBootstrapper.java:82)
at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:100)
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178)
... 15 common frames omitted

Please help me fix it. Thanks.

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    dttutoria Expert
    2022-07-05T08:52:21+00:00Added an answer on July 5, 2022 at 8:52 am

    The cause:

    Cause 1: The issue was brought on by a springboot version update.

    Cause 2: Since 2.6.0 began utilizing PathPatternParser based path matching, whereas Springfox has not been changed and didn’t use AntPathMatcher.

     

    Solution:

    There are two answers discovered to solve cause 1.

    -Reduce springboot to version 2.5.7, although this is simply a short-term fix.
    -The problem can be solved by switching from SpringFox to SpringDoc, however the project that is already live would still require a lot of adjustments.

    It’s also extremely easy to resolve the cause 2. Simply change the AntPathMatcher path matching pattern in the yaml file to the SpringBoot path matching pattern.

    The set-up looks like this.

    spring:
    mvc:
    pathmatch:
    matching-strategy: ANT_PATH_MATCHER
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