Issue with swagger2 and SpringMVC- taking lot of time to run the app

Question

I'm currently using Springfox Swagger2 to provide API UI(Swagger-UI) and document my spring mvc application with a Java config. To starts my API it was originally taken about 90 seconds, with the whole scanning process. There are around 12-15 modules and 100 controller in my project, it was a desktop application based on servlet & hibernate technology which we are now converting to SpringMVC . After I added Swagger2 Configuration and try to run the project it was not running even after 2000s also(my app normally take 90s to start before adding swagger2).

Below are the statement after which my build is getting hanged/Slow :

S2019-11-22 18:04:59,151 - 62936 - INFO  - [127.0.0.1|main|system] - ContextLoader.initWebApplicationContext():271 - Root WebApplicationContext: initialization started
S2019-11-22 18:05:01,915 - 65700 - INFO  - [127.0.0.1|main|system] - PropertySourcedRequestMappingHandlerMapping.initHandlerMethods():69 - Mapped URL path [/v2/api-docs] onto method [springfox.documentation.swagger2.web.Swagger2Controller#getDocumentation(String, HttpServletRequest)]
S2019-11-22 18:05:02,275 - 66060 - INFO  - [127.0.0.1|main|system] - DocumentationPluginsBootstrapper.start():160 - Context refreshed
S2019-11-22 18:05:02,347 - 66132 - INFO  - [127.0.0.1|main|system] - DocumentationPluginsBootstrapper.start():163 - Found 1 custom documentation plugin(s)
S2019-11-22 18:05:02,411 - 66196 - INFO  - [127.0.0.1|main|system] - ApiListingReferenceScanner.scan():41 - Scanning for api listing reference

I currently just need the controller information without any model info. I already excluded model scanning from the startup process in order to make my API start, but it is not working?

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    Class[] clazz = {JsonUtil.class, MasterEnum.class, MasterDataController.class,
            AppExceptionHandler.class, CountryMapper.class, MasterServiceImpl.class,
            MasterService.class, EndPointConfigurationUtil.class, MasterVO.class, CountryVO.class};

    @Bean
    public Docket api(){
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.tentelemed.eaihs.web.controller"))
                .paths(PathSelectors.regex("/.*"))
                .build()
                .apiInfo(apiInfo()).ignoredParameterTypes(clazz);
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("TITLE")
                .description("DESCRIPTION")
                .version("VERSION")
                .termsOfServiceUrl("http://terms-of-services.url")
                .license("LICENSE")
                .licenseUrl("http://url-to-license.com")
                .build();
    }
}

And are there any other ways to make it run? I'm using swagger 2.9.2. If you want any additional information please let me know.Thanks in advance!!!!!

EDIT::After I waited for 3596s I got below error log

S2019-11-22 19:03:57,608 - 3601393 - WARN  - [127.0.0.1|main|system] - AbstractApplicationContext.refresh():558 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
S2019-11-22 19:03:57,624 - 3601409 - ERROR - [127.0.0.1|main|system] - ContextLoader.initWebApplicationContext():313 - Context initialization failed
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:185)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
    at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:890)
    at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:532)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:853)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:344)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785)
    at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:261)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:133)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:115)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:167)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:133)
    at org.eclipse.jetty.server.Server.start(Server.java:418)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:107)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
    at org.eclipse.jetty.server.Server.doStart(Server.java:385)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at com.app.serverimpl.JettyServerManager.startJetty(JettyServerManager.java:200)
    at com.app.serverimpl.ServerMain.startServer(ServerMain.java:150)
    at com.app.serverimpl.ServerMainEA.main(ServerMainEA.java:19)
Caused by: com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
    at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2212)
    at com.google.common.cache.LocalCache.get(LocalCache.java:4053)
    at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)
    at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4986)
    at springfox.documentation.schema.CachingModelDependencyProvider.dependentModels(CachingModelDependencyProvider.java:58)
    at springfox.documentation.schema.DefaultModelProvider.dependencies(DefaultModelProvider.java:128)
    at springfox.documentation.schema.CachingModelProvider.dependencies(CachingModelProvider.java:68)
    at springfox.documentation.spring.web.scanners.ApiModelReader.populateDependencies(ApiModelReader.java:136)
    at springfox.documentation.spring.web.scanners.ApiModelReader.read(ApiModelReader.java:78)
    at springfox.documentation.spring.web.scanners.ApiListingScanner.scan(ApiListingScanner.java:133)
    at springfox.documentation.spring.web.scanners.ApiDocumentationScanner.scan(ApiDocumentationScanner.java:71)
    at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.scanDocumentation(DocumentationPluginsBootstrapper.java:101)
    at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:167)
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)
    ... 30 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:3181)
    at java.util.ArrayList.grow(ArrayList.java:265)
    at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:239)
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:231)
    at java.util.ArrayList.addAll(ArrayList.java:583)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:181)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromCollectionElementType(DefaultModelDependencyProvider.java:220)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:181)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromRegularType(DefaultModelDependencyProvider.java:207)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:183)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromRegularType(DefaultModelDependencyProvider.java:207)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:183)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromCollectionElementType(DefaultModelDependencyProvider.java:220)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:181)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromCollectionElementType(DefaultModelDependencyProvider.java:220)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:181)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromRegularType(DefaultModelDependencyProvider.java:207)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:183)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.maybeFromRegularType(DefaultModelDependencyProvider.java:207)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedPropertiesAndFields(DefaultModelDependencyProvider.java:183)
    at springfox.documentation.schema.DefaultModelDependencyProvider.resolvedDependencies(DefaultModelDependencyProvider.java:120)
    at springfox.documentation.schema.DefaultModelDependencyProvider.dependentModels(DefaultModelDependencyProvider.java:79)
    at springfox.documentation.schema.CachingModelDependencyProvider$1.load(CachingModelDependencyProvider.java:50)
    at springfox.documentation.schema.CachingModelDependencyProvider$1.load(CachingModelDependencyProvider.java:48)
    at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3628)
S2019-11-22 19:03:58,371 - 3602156 - ERROR - [127.0.0.1|main|system] - JettyServerManager.startJetty():211 - Jetty failed to start !
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:185)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
    at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:890)
    at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:532)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:853)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:344)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785)
    at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:261)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:133)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:115)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:167)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:133)
    at org.eclipse.jetty.server.Server.start(Server.java:418)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:107)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
    at org.eclipse.jetty.server.Server.doStart(Server.java:385)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at com.app.serverimpl.JettyServerManager.startJetty(JettyServerManager.java:200)
    at com.app.serverimpl.ServerMain.startServer(ServerMain.java:150)
    at com.app.serverimpl.ServerMainEA.main(ServerMainEA.java:19)
Caused by: com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
    at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2212)
    at com.google.common.cache.LocalCache.get(LocalCache.java:4053)

score 1 · Answer 1 · answered Feb 15 '21 at 12:21

1

Springfox 2.9.2 has problem with multiple mannyToManny relationships. If you have in your DAO or DTO these relationships you need to simplify them with @JsonIgnore @JsonIgnoreProperties. This is because of traversal implementation. By default springfox does not traverse every DTO only once but multiple times based on number of reference in DTO.

answered Feb 15 '21 at 12:21

Delirante

809
8
12

@JsonIgnore before the method definition? – Harish Kumar Aug 23 '21 at 09:39

score 0 · Answer 2 · answered May 25 '22 at 11:04

0

The solution, in my case, was to disable the lazy init (I've enabled it before):

spring.main.lazy-initialization=false

I know it's strange...

answered May 25 '22 at 11:04

justCurious

720
7
13

Issue with swagger2 and SpringMVC- taking lot of time to run the app

2 Answers2