我有一个使用 Spring Boot Actuator 的 Java 后端，但它不会在 Digitalocean Ubuntu VPS 上启动。 相同的应用程序在我的 Mac 和另一台 Ubuntu PC 上运行良好。
szabolcs@SmartUpProd:~/smartup$ java -Xmx1536m -jar build/libs/smartup-backend-0.1.0.jar
它开始初始化，但每次都在同一点停止(没有异常(exception)，只是挂起)。如果我此时尝试使用 ^C 停止它，它不会带回 shell。
这是输出:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.1.5.RELEASE)
2014-09-04 04:19:27.697 INFO 1724 --- [ main] com.smartup.SmartUpConfiguration : Starting SmartUpConfiguration on SmartUpProd with PID 1724 (/home/szabolcs/smartup/build/libs/smartup-backend-0.1.0.jar started by szabolcs in /home/szabolcs/smartup)
2014-09-04 04:19:27.783 INFO 1724 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@464e53bb: startup date [Thu Sep 04 04:19:27 EDT 2014]; root of context hierarchy
2014-09-04 04:19:28.911 INFO 1724 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2014-09-04 04:19:30.225 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'smartUpConfiguration' of type [class com.smartup.SmartUpConfiguration$$EnhancerBySpringCGLIB$$ec37524d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:30.254 INFO 1724 --- [ main] o.s.j.d.DriverManagerDataSource : Loaded JDBC driver: com.mysql.jdbc.Driver
2014-09-04 04:19:30.266 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'dataSource' of type [class org.springframework.jdbc.datasource.DriverManagerDataSource] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:30.293 INFO 1724 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2014-09-04 04:19:30.440 INFO 1724 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
2014-09-04 04:19:30.452 INFO 1724 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {4.0.1.Final}
2014-09-04 04:19:30.457 INFO 1724 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2014-09-04 04:19:30.459 INFO 1724 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2014-09-04 04:19:30.486 INFO 1724 --- [ main] org.hibernate.ejb.Ejb3Configuration : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2014-09-04 04:19:30.826 INFO 1724 --- [ main] o.h.s.j.c.i.ConnectionProviderInitiator : HHH000130: Instantiating explicit connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
2014-09-04 04:19:31.175 INFO 1724 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
2014-09-04 04:19:31.188 INFO 1724 --- [ main] o.h.e.jdbc.internal.LobCreatorBuilder : HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
2014-09-04 04:19:31.208 INFO 1724 --- [ main] o.h.e.t.i.TransactionFactoryInitiator : HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
2014-09-04 04:19:31.218 INFO 1724 --- [ main] o.h.h.i.ast.ASTQueryTranslatorFactory : HHH000397: Using ASTQueryTranslatorFactory
2014-09-04 04:19:31.657 INFO 1724 --- [ main] org.hibernate.tool.hbm2ddl.SchemaUpdate : HHH000228: Running hbm2ddl schema update
[...]
2014-09-04 04:19:31.768 INFO 1724 --- [ main] org.hibernate.tool.hbm2ddl.SchemaUpdate : HHH000232: Schema update complete
2014-09-04 04:19:31.947 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'entityManagerFactory' of type [class org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:32.092 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$7460673f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:32.119 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'transactionAttributeSource' of type [class org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:32.148 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'transactionInterceptor' of type [class org.springframework.transaction.interceptor.TransactionInterceptor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:32.167 INFO 1724 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.config.internalTransactionAdvisor' of type [class org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2014-09-04 04:19:32.574 INFO 1724 --- [ main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
2014-09-04 04:19:32.803 INFO 1724 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2014-09-04 04:19:32.805 INFO 1724 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/7.0.54
2014-09-04 04:19:32.956 INFO 1724 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2014-09-04 04:19:32.957 INFO 1724 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 5178 ms
2014-09-04 04:19:35.202 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/css/**'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/js/**'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/images/**'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/**/favicon.ico'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/info'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/health'], []
2014-09-04 04:19:35.203 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: Ant [pattern='/error'], []
2014-09-04 04:19:35.252 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: org.springframework.security.web.util.matcher.AnyRequestMatcher@1, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@5c4b8904, org.springframework.security.web.context.SecurityContextPersistenceFilter@36b59af2, org.springframework.security.web.header.HeaderWriterFilter@71880af1, org.springframework.security.web.authentication.logout.LogoutFilter@1cd26cc7, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@10e5d335, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@6c2a1c3a, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@5c58c840, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@166e5d45, org.springframework.security.web.session.SessionManagementFilter@49040d09, org.springframework.security.web.access.ExceptionTranslationFilter@2d18c028, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@5dc9dca8]
2014-09-04 04:19:35.257 INFO 1724 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/dump'], Ant [pattern='/dump/'], Ant [pattern='/dump.*'], Ant [pattern='/env'], Ant [pattern='/env/'], Ant [pattern='/env.*'], Ant [pattern='/configprops'], Ant [pattern='/configprops/'], Ant [pattern='/configprops.*'], Ant [pattern='/autoconfig'], Ant [pattern='/autoconfig/'], Ant [pattern='/autoconfig.*'], Ant [pattern='/mappings'], Ant [pattern='/mappings/'], Ant [pattern='/mappings.*'], Ant [pattern='/trace'], Ant [pattern='/trace/'], Ant [pattern='/trace.*'], Ant [pattern='/metrics'], Ant [pattern='/metrics/'], Ant [pattern='/metrics.*'], Ant [pattern='/beans'], Ant [pattern='/beans/'], Ant [pattern='/beans.*']]], [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@73762e60, org.springframework.security.web.context.SecurityContextPersistenceFilter@3d8b310e, org.springframework.security.web.header.HeaderWriterFilter@5ef9f4c9, org.springframework.security.web.authentication.logout.LogoutFilter@2fa7040e, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@3ae20f72, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@1bd98f6, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@10736bb4, org.springframework.security.web.session.SessionManagementFilter@4bde96b2, org.springframework.security.web.access.ExceptionTranslationFilter@56ed5cfd, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@2df2e9b6]
2014-09-04 04:19:35.391 INFO 1724 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2014-09-04 04:19:35.395 INFO 1724 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'metricFilter' to: [/*]
2014-09-04 04:19:35.396 INFO 1724 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'springSecurityFilterChain' to: [/*]
2014-09-04 04:19:35.396 INFO 1724 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2014-09-04 04:19:35.396 INFO 1724 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'applicationContextIdFilter' to: [/*]
2014-09-04 04:19:35.396 INFO 1724 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'webRequestLoggingFilter' to: [/*]
这是 ^C 之后的输出:
^C2014-09-04 04:34:46.560 INFO 1724 --- [ Thread-2] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@464e53bb: startup date [Thu Sep 04 04:19:27 EDT 2014]; root of context hierarchy
2014-09-04 04:34:46.573 WARN 1724 --- [ Thread-2] ationConfigEmbeddedWebApplicationContext : Exception thrown from LifecycleProcessor on context close
java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@464e53bb: startup date [Thu Sep 04 04:19:27 EDT 2014]; root of context hierarchy
at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:359)
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:888)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.doClose(EmbeddedWebApplicationContext.java:152)
at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:809)
2014-09-04 04:34:46.601 INFO 1724 --- [ Thread-2] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
有人遇到过同样的问题吗？你们能帮帮我吗？
这里有线程转储(当它挂起时):
szabolcs@SmartUpProd:~$ jstack 2616
2014-09-04 07:33:30
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.20-b23 mixed mode):
"Attach Listener" #14 daemon prio=9 os_prio=0 tid=0x00007fb678001000 nid=0xaae waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"localhost-startStop-1" #13 daemon prio=5 os_prio=0 tid=0x00007fb65000d000 nid=0xa46 runnable [0x00007fb662fec000]
java.lang.Thread.State: RUNNABLE
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:246)
at sun.security.provider.SeedGenerator$URLSeedGenerator.getSeedBytes(SeedGenerator.java:539)
at sun.security.provider.SeedGenerator.generateSeed(SeedGenerator.java:144)
at sun.security.provider.SecureRandom$SeederHolder.<clinit>(SecureRandom.java:192)
at sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:210)
- locked <0x00000000f15173a0> (a sun.security.provider.SecureRandom)
at java.security.SecureRandom.nextBytes(SecureRandom.java:457)
- locked <0x00000000f15176c0> (a java.security.SecureRandom)
at java.security.SecureRandom.next(SecureRandom.java:480)
at java.util.Random.nextInt(Random.java:329)
at org.apache.catalina.util.SessionIdGenerator.createSecureRandom(SessionIdGenerator.java:246)
at org.apache.catalina.util.SessionIdGenerator.getRandomBytes(SessionIdGenerator.java:183)
at org.apache.catalina.util.SessionIdGenerator.generateSessionId(SessionIdGenerator.java:153)
at org.apache.catalina.session.ManagerBase.startInternal(ManagerBase.java:573)
at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:485)
- locked <0x00000000f1395fc0> (a org.apache.catalina.session.StandardManager)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f1395fc0> (a org.apache.catalina.session.StandardManager)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5476)
- locked <0x00000000f675e1a8> (a org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedContext)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f675e1a8> (a org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedContext)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
"Tomcat-startStop-1" #12 daemon prio=5 os_prio=0 tid=0x00007fb65f35b000 nid=0xa45 waiting on condition [0x00007fb6801d8000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000f675e178> (a java.util.concurrent.FutureTask)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
at java.util.concurrent.FutureTask.get(FutureTask.java:191)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
- locked <0x00000000f6705460> (a org.apache.catalina.core.StandardHost)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:799)
- locked <0x00000000f6705460> (a org.apache.catalina.core.StandardHost)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f6705460> (a org.apache.catalina.core.StandardHost)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
"DestroyJavaVM" #10 prio=5 os_prio=0 tid=0x00007fb6a0009800 nid=0xa39 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"main" #9 prio=5 os_prio=0 tid=0x00007fb6a01cf800 nid=0xa44 waiting on condition [0x00007fb6808ef000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000f6705430> (a java.util.concurrent.FutureTask)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
at java.util.concurrent.FutureTask.get(FutureTask.java:191)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
- locked <0x00000000f675c598> (a org.apache.catalina.core.StandardEngine)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)
- locked <0x00000000f675c598> (a org.apache.catalina.core.StandardEngine)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f675c598> (a org.apache.catalina.core.StandardEngine)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
- locked <0x00000000f675c598> (a org.apache.catalina.core.StandardEngine)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f675bc98> (a org.apache.catalina.core.StandardService)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:731)
- locked <0x00000000f675c340> (a [Lorg.apache.catalina.Service;)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
- locked <0x00000000f675bd68> (a org.apache.catalina.core.StandardServer)
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:341)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:85)
- locked <0x00000000f6bbad18> (a org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.<init>(TomcatEmbeddedServletContainer.java:74)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getTomcatEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:289)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:146)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:159)
- locked <0x00000000a0d8f098> (a org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:132)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:476)
- locked <0x00000000a0d8f2c8> (a java.lang.Object)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:120)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
at com.smartup.SmartUpConfiguration.main(SmartUpConfiguration.java:78)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
at java.lang.Thread.run(Thread.java:745)
"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007fb6a0152000 nid=0xa42 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fb6a0132800 nid=0xa41 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fb6a012f800 nid=0xa40 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fb6a012d800 nid=0xa3f runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fb6a00ff000 nid=0xa3e in Object.wait() [0x00007fb69041e000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000a0487660> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
- locked <0x00000000a0487660> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fb6a00fd000 nid=0xa3d in Object.wait() [0x00007fb69051f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000a04876a0> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
- locked <0x00000000a04876a0> (a java.lang.ref.Reference$Lock)
"VM Thread" os_prio=0 tid=0x00007fb6a00f6000 nid=0xa3c runnable
"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007fb6a001f000 nid=0xa3a runnable
"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007fb6a0020800 nid=0xa3b runnable
"VM Periodic Task Thread" os_prio=0 tid=0x00007fb6a0154000 nid=0xa43 waiting on condition
JNI global references: 48
最佳答案
localhost-startStop-1 正在尝试创建 SecureRandom 的新实例，但在尝试从熵源读取数据时卡住了。这通常是因为源已耗尽。默认熵源是 /dev/random。它被称为阻塞源，因为当尝试读取随机数据并且没有可用数据时它会阻塞。 Linux 上的另一个来源是 /dev/urandom。与 /dev/random 相比，它的主要优点是它是非阻塞的。关于使用 /dev/urandom 是否会降低安全性存在一些争论。 This article可能会感兴趣。
总而言之，使用 /dev/urandom 将避免您遇到的问题，但可能会降低安全性。您可以通过系统属性配置 Spring Boot 的嵌入式 Tomcat 实例以使用 /dev/urandom:
-Djava.security.egd=file:/dev/./urandom
关于java - Spring Boot Actuator 应用程序无法在 Ubuntu VPS 上启动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25660899/
我需要在客户计算机上运行Ruby应用程序。通常需要几天才能完成(复制大备份文件)。问题是如果启用sleep，它会中断应用程序。否则，计算机将持续运行数周，直到我下次访问为止。有什么方法可以防止执行期间休眠并让Windows在执行后休眠吗？欢迎任何疯狂的想法;-) 最佳答案 Here建议使用SetThreadExecutionStateWinAPI函数，使应用程序能够通知系统它正在使用中，从而防止系统在应用程序运行时进入休眠状态或关闭显示。像这样的东西:require'Win32API'ES_AWAYMODE_REQUIRED=0x0
我在从html页面生成PDF时遇到问题。我正在使用PDFkit。在安装它的过程中，我注意到我需要wkhtmltopdf。所以我也安装了它。我做了PDFkit的文档所说的一切......现在我在尝试加载PDF时遇到了这个错误。这里是错误:commandfailed:"/usr/local/bin/wkhtmltopdf""--margin-right""0.75in""--page-size""Letter""--margin-top""0.75in""--margin-bottom""0.75in""--encoding""UTF-8""--margin-left""0.75in""-
对于具有离线功能的智能手机应用程序，我正在为Xml文件创建单向文本同步。我希望我的服务器将增量/差异(例如GNU差异补丁)发送到目标设备。这是计划:Time=0Server:hasversion_1ofXmlfile(~800kiB)Client:hasversion_1ofXmlfile(~800kiB)Time=1Server:hasversion_1andversion_2ofXmlfile(each~800kiB)computesdeltaoftheseversions(=patch)(~10kiB)sendspatchtoClient(~10kiBtransferred)Cl
Rackup通过Rack的默认处理程序成功运行任何Rack应用程序。例如:classRackAppdefcall(environment)['200',{'Content-Type'=>'text/html'},["Helloworld"]]endendrunRackApp.new但是当最后一行更改为使用Rack的内置CGI处理程序时，rackup给出“NoMethodErrorat/undefinedmethod`call'fornil:NilClass”:Rack::Handler::CGI.runRackApp.newRack的其他内置处理程序也提出了同样的反对意见。例如Rack
我想用ruby编写一个小的命令行实用程序并将其作为gem分发。我知道安装后，Guard、Sass和Thor等某些gem可以从命令行自行运行。为了让gem像二进制文件一样可用，我需要在我的gemspec中指定什么。 最佳答案 Gem::Specification.newdo|s|...s.executable='name_of_executable'...endhttp://docs.rubygems.org/read/chapter/20 关于ruby-在Ruby中编写命令行实用程序
我对最新版本的Rails有疑问。我创建了一个新应用程序(railsnewMyProject)，但我没有脚本/生成，只有脚本/rails，当我输入ruby./script/railsgeneratepluginmy_plugin"Couldnotfindgeneratorplugin.".你知道如何生成插件模板吗？没有这个命令可以创建插件吗？PS:我正在使用Rails3.2.1和ruby1.8.7[universal-darwin11.0] 最佳答案 随着Rails3.2.0的发布，插件生成器已经被移除。查看变更日志here.现在
我构建了两个需要相互通信和发送文件的Rails应用程序。例如，一个Rails应用程序会发送请求以查看其他应用程序数据库中的表。然后另一个应用程序将呈现该表的json并将其发回。我还希望一个应用程序将存储在其公共(public)目录中的文本文件发送到另一个应用程序的公共(public)目录。我从来没有做过这样的事情，所以我什至不知道从哪里开始。任何帮助，将不胜感激。谢谢! 最佳答案 无论Rails是什么，几乎所有Web应用程序都有您的要求，大多数现代Web应用程序都需要相互通信。但是有一个小小的理解需要你坚持下去，网站不应直接访问彼此
我尝试运行2.x应用程序。我使用rvm并为此应用程序设置其他版本的ruby:$rvmuseree-1.8.7-head我尝试运行服务器，然后出现很多错误:$script/serverNOTE:Gem.source_indexisdeprecated,useSpecification.Itwillberemovedonorafter2011-11-01.Gem.source_indexcalledfrom/Users/serg/rails_projects_terminal/work_proj/spohelp/config/../vendor/rails/railties/lib/r
刚入门rails，开始慢慢理解。有人可以解释或给我一些关于在application_controller中编码的好处或时间和原因的想法吗？有哪些用例。您如何为Rails应用程序使用应用程序Controller？我不想在那里放太多代码，因为据我了解，每个请求都会调用此Controller。这是真的？ 最佳答案 ApplicationController实际上是您应用程序中的每个其他Controller都将从中继承的类(尽管这不是强制性的)。我同意不要用太多代码弄乱它并保持干净整洁的态度，尽管在某些情况下ApplicationContr
我正在尝试在我的centos服务器上安装therubyracer，但遇到了麻烦。$geminstalltherubyracerBuildingnativeextensions.Thiscouldtakeawhile...ERROR:Errorinstallingtherubyracer:ERROR:Failedtobuildgemnativeextension./usr/local/rvm/rubies/ruby-1.9.3-p125/bin/rubyextconf.rbcheckingformain()in-lpthread...yescheckingforv8.h...no***e