Question

我最近部署了一个计划每天运行的Spring Boot应用程序，以便从Cassandra集群中解析新数据。经过大约20个小时的工作（对Cassandra进行了数百万次读/写访问），出现了一些内存问题，并且在每次迭代时（异常都在循环内捕获）我有这个错误：

java.lang.RuntimeException: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory.createAccessorClass(ClassGeneratingPropertyAccessorFactory.java:170)
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory.potentiallyCreateAndRegisterPersistentPropertyAccessorClass(ClassGeneratingPropertyAccessorFactory.java:154)
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory.getPropertyAccessor(ClassGeneratingPropertyAccessorFactory.java:80)
    at org.springframework.data.mapping.model.BasicPersistentEntity.getPropertyAccessor(BasicPersistentEntity.java:425)
    at org.springframework.data.cassandra.convert.MappingCassandraConverter.getConvertingAccessor(MappingCassandraConverter.java:611)
    at org.springframework.data.cassandra.convert.MappingCassandraConverter.readEntityFromRow(MappingCassandraConverter.java:172)
    at org.springframework.data.cassandra.convert.MappingCassandraConverter.readRow(MappingCassandraConverter.java:149)
    at com.myapp.utils.CassandraIterable$1.next(CassandraIterable.java:35)
    at com.myapp.service.packer.PositionParsingService.parse(PositionParsingService.java:60)
    at com.myapp.service.packer.PositionLoadService.update(PositionLoadService.java:202)
    at com.myapp.service.packer.PositionLoadService.updateVehicle(PositionLoadService.java:129)
    at com.myapp.service.packer.PositionLoadService.updateAllVehicles(PositionLoadService.java:99)
    at com.myapp.service.packer.PositionLoadService.updateAllVehicles(PositionLoadService.java:84)
    at com.myapp.service.packer.PositionLoadService$$FastClassBySpringCGLIB$$2605bc6c.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:115)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory$Evil.defineClass(ClassGeneratingPropertyAccessorFactory.java:1480)
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory$PropertyAccessorClassGenerator.generateCustomAccessorClass(ClassGeneratingPropertyAccessorFactory.java:282)
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory.createAccessorClass(ClassGeneratingPropertyAccessorFactory.java:168)
    ... 21 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
    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:498)
    at org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory$Evil.defineClass(ClassGeneratingPropertyAccessorFactory.java:1476)
    ... 23 common frames omitted
Caused by: java.lang.OutOfMemoryError: Compressed class space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    ... 28 common frames omitted

通过分析问题发生后产生的内存转储，我收到了这份报告：

从Java任务控制开始，在运行垃圾收集后，我得到：

我不认为我的代码直接对泄漏负责，即使它可能会在应该发布的时候发布，或者可能存在我忽略的配置问题。

我尝试将Java从JDK SE 8u60升级到8u121，并将Spring启动升级到版本1.5.2.RELEASE。这是完整的依赖项列表：

com.myapp:jar:0.0.1-SNAPSHOT
+- org.springframework.boot:spring-boot-starter-data-jpa:jar:1.5.2.RELEASE:compile
|  +- org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile
|  |  +- (org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework.boot:spring-boot-autoconfigure:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.2.RELEASE:compile
|  |  |  +- ch.qos.logback:logback-classic:jar:1.1.11:compile
|  |  |  |  +- ch.qos.logback:logback-core:jar:1.1.11:compile
|  |  |  |  \- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.22; omitted for duplicate)
|  |  |  +- org.slf4j:jcl-over-slf4j:jar:1.7.24:compile
|  |  |  |  \- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.22; omitted for duplicate)
|  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.24:compile
|  |  |  |  \- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.22; omitted for duplicate)
|  |  |  \- org.slf4j:log4j-over-slf4j:jar:1.7.24:compile
|  |  |     \- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.22; omitted for duplicate)
|  |  +- org.springframework:spring-core:jar:4.3.7.RELEASE:compile
|  |  \- org.yaml:snakeyaml:jar:1.17:runtime
|  +- org.springframework.boot:spring-boot-starter-aop:jar:1.5.2.RELEASE:compile
|  |  +- (org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  |  +- org.springframework:spring-aop:jar:4.3.7.RELEASE:compile
|  |  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  \- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  \- org.aspectj:aspectjweaver:jar:1.8.9:compile
|  +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.5.2.RELEASE:compile
|  |  +- (org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  |  +- org.apache.tomcat:tomcat-jdbc:jar:8.5.11:compile
|  |  |  \- org.apache.tomcat:tomcat-juli:jar:8.5.11:compile
|  |  \- org.springframework:spring-jdbc:jar:4.3.7.RELEASE:compile
|  |     +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |     +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |     \- (org.springframework:spring-tx:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  +- org.hibernate:hibernate-core:jar:5.0.12.Final:compile
|  |  +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
|  |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
|  |  +- org.javassist:javassist:jar:3.21.0-GA:compile (version managed from 3.18.1-GA)
|  |  +- antlr:antlr:jar:2.7.7:compile
|  |  +- org.jboss:jandex:jar:2.0.0.Final:compile
|  |  +- dom4j:dom4j:jar:1.6.1:compile
|  |  \- org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile
|  |     \- (org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile - omitted for duplicate)
|  +- org.hibernate:hibernate-entitymanager:jar:5.0.12.Final:compile
|  |  +- (org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile - omitted for duplicate)
|  |  +- (org.hibernate:hibernate-core:jar:5.0.12.Final:compile - omitted for duplicate)
|  |  +- (dom4j:dom4j:jar:1.6.1:compile - omitted for duplicate)
|  |  +- (org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile - omitted for duplicate)
|  |  +- (org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile - omitted for duplicate)
|  |  \- (org.javassist:javassist:jar:3.21.0-GA:compile - version managed from 3.18.1-GA; omitted for duplicate)
|  +- javax.transaction:javax.transaction-api:jar:1.2:compile
|  +- org.springframework.data:spring-data-jpa:jar:1.11.1.RELEASE:compile
|  |  +- org.springframework.data:spring-data-commons:jar:1.13.1.RELEASE:compile
|  |  |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.22; omitted for duplicate)
|  |  |  \- (org.slf4j:jcl-over-slf4j:jar:1.7.24:runtime - omitted for duplicate)
|  |  +- org.springframework:spring-orm:jar:4.3.7.RELEASE:compile
|  |  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.springframework:spring-jdbc:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  \- (org.springframework:spring-tx:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- org.springframework:spring-context:jar:4.3.7.RELEASE:compile
|  |  |  +- (org.springframework:spring-aop:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  |  \- (org.springframework:spring-expression:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework:spring-aop:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework:spring-tx:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- org.springframework:spring-beans:jar:4.3.7.RELEASE:compile
|  |  |  \- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- org.slf4j:slf4j-api:jar:1.7.24:compile
|  |  \- (org.slf4j:jcl-over-slf4j:jar:1.7.24:compile - scope updated from runtime; omitted for duplicate)
|  \- org.springframework:spring-aspects:jar:4.3.7.RELEASE:compile
|     \- (org.aspectj:aspectjweaver:jar:1.8.9:compile - omitted for duplicate)
+- org.springframework.boot:spring-boot-starter-web:jar:1.5.2.RELEASE:compile
|  +- (org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.5.2.RELEASE:compile
|  |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.11:compile
|  |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.11:compile
|  |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.11:compile
|  |     \- (org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.11:compile - omitted for duplicate)
|  +- org.hibernate:hibernate-validator:jar:5.3.4.Final:compile
|  |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
|  |  +- (org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile - omitted for duplicate)
|  |  \- com.fasterxml:classmate:jar:1.3.3:compile (version managed from 1.3.1)
|  +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile
|  |  +- (com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile - omitted for duplicate)
|  |  \- (com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile - omitted for duplicate)
|  +- org.springframework:spring-web:jar:4.3.7.RELEASE:compile
|  |  +- (org.springframework:spring-aop:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  +- (org.springframework:spring-context:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  \- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  \- org.springframework:spring-webmvc:jar:4.3.7.RELEASE:compile
|     +- (org.springframework:spring-aop:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     +- (org.springframework:spring-context:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     +- org.springframework:spring-expression:jar:4.3.7.RELEASE:compile
|     |  \- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     \- (org.springframework:spring-web:jar:4.3.7.RELEASE:compile - omitted for duplicate)
+- org.springframework.boot:spring-boot-starter-data-cassandra:jar:1.5.2.RELEASE:compile
|  +- (org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile - omitted for duplicate)
|  +- org.springframework:spring-tx:jar:4.3.7.RELEASE:compile
|  |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  \- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  \- org.springframework.data:spring-data-cassandra:jar:1.5.1.RELEASE:compile
|     +- org.springframework.data:spring-cql:jar:1.5.1.RELEASE:compile
|     |  +- (org.springframework:spring-context:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     |  +- (org.springframework:spring-beans:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     |  +- (org.springframework:spring-expression:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     |  +- (org.springframework:spring-tx:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     |  +- (org.springframework.data:spring-data-commons:jar:1.13.1.RELEASE:compile - omitted for duplicate)
|     |  +- (com.datastax.cassandra:cassandra-driver-core:jar:3.1.4:compile - version managed from 3.1.3; omitted for duplicate)
|     |  +- (com.google.guava:guava:jar:19.0:compile - omitted for conflict with 16.0.1)
|     |  +- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.7; omitted for duplicate)
|     |  \- (org.slf4j:jcl-over-slf4j:jar:1.7.24:runtime - omitted for duplicate)
|     +- (org.springframework:spring-expression:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|     +- (org.springframework.data:spring-data-commons:jar:1.13.1.RELEASE:compile - omitted for duplicate)
|     +- (com.datastax.cassandra:cassandra-driver-core:jar:3.1.4:compile - version managed from 3.1.3; omitted for duplicate)
|     +- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.7; omitted for duplicate)
|     \- (org.slf4j:jcl-over-slf4j:jar:1.7.24:compile - scope updated from runtime; omitted for duplicate)
+- org.springframework.boot:spring-boot-devtools:jar:1.5.2.RELEASE:compile
|  +- org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:compile
|  |  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  |  \- (org.springframework:spring-context:jar:4.3.7.RELEASE:compile - omitted for duplicate)
|  \- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.2.RELEASE:compile
|     \- (org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:compile - omitted for duplicate)
+- com.datastax.cassandra:cassandra-driver-mapping:jar:3.1.4:compile
|  \- com.datastax.cassandra:cassandra-driver-core:jar:3.1.4:compile
|     +- io.netty:netty-handler:jar:4.0.37.Final:compile
|     |  +- io.netty:netty-buffer:jar:4.0.37.Final:compile
|     |  |  \- io.netty:netty-common:jar:4.0.37.Final:compile
|     |  +- io.netty:netty-transport:jar:4.0.37.Final:compile
|     |  |  \- (io.netty:netty-buffer:jar:4.0.37.Final:compile - omitted for duplicate)
|     |  \- io.netty:netty-codec:jar:4.0.37.Final:compile
|     |     \- (io.netty:netty-transport:jar:4.0.37.Final:compile - omitted for duplicate)
|     +- com.google.guava:guava:jar:16.0.1:compile
|     +- io.dropwizard.metrics:metrics-core:jar:3.1.3:compile (version managed from 3.1.2)
|     |  \- (org.slf4j:slf4j-api:jar:1.7.24:compile - version managed from 1.7.7; omitted for duplicate)
|     +- com.github.jnr:jnr-ffi:jar:2.0.7:compile
|     |  +- com.github.jnr:jffi:jar:1.2.10:compile
|     |  +- com.github.jnr:jffi:jar:native:1.2.10:runtime
|     |  +- org.ow2.asm:asm:jar:5.0.3:compile
|     |  +- org.ow2.asm:asm-commons:jar:5.0.3:compile
|     |  |  \- (org.ow2.asm:asm-tree:jar:5.0.3:compile - omitted for duplicate)
|     |  +- org.ow2.asm:asm-analysis:jar:5.0.3:compile
|     |  |  \- (org.ow2.asm:asm-tree:jar:5.0.3:compile - omitted for duplicate)
|     |  +- org.ow2.asm:asm-tree:jar:5.0.3:compile
|     |  |  \- (org.ow2.asm:asm:jar:5.0.3:compile - omitted for duplicate)
|     |  +- org.ow2.asm:asm-util:jar:5.0.3:compile
|     |  |  \- (org.ow2.asm:asm-tree:jar:5.0.3:compile - omitted for duplicate)
|     |  \- com.github.jnr:jnr-x86asm:jar:1.0.2:compile
|     \- com.github.jnr:jnr-posix:jar:3.0.27:compile
|        +- (com.github.jnr:jnr-ffi:jar:2.0.7:compile - omitted for duplicate)
|        \- com.github.jnr:jnr-constants:jar:0.9.0:compile
+- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.8.7:compile
|  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile
|  +- com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile
|  \- (com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile - omitted for duplicate)
+- com.oracle.jdbc:ojdbc7:jar:12.1.0.2:compile
|  +- com.oracle.jdbc:xdb6:jar:12.1.0.2:compile
|  +- com.oracle.jdbc:orai18n:jar:12.1.0.2:compile
|  +- com.oracle.jdbc:xmlparserv2:jar:12.1.0.2:compile
|  +- com.oracle.jdbc:oraclepki:jar:12.1.0.2:compile
|  +- com.oracle.jdbc:osdt_cert:jar:12.1.0.2:compile
|  \- com.oracle.jdbc:osdt_core:jar:12.1.0.2:compile
+- com.mycompany:Pandora-json:jar:2.1.0-SNAPSHOT:compile
|  +- (com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile - version managed from 2.5.4; omitted for duplicate)
|  +- (com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile - version managed from 2.5.4; omitted for duplicate)
|  +- com.fasterxml.jackson.datatype:jackson-datatype-joda:jar:2.8.7:compile (version managed from 2.5.4)
|  |  +- (com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile - version managed from 2.5.4; omitted for duplicate)
|  |  +- (com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile - omitted for duplicate)
|  |  +- (com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile - version managed from 2.5.4; omitted for duplicate)
|  |  \- (joda-time:joda-time:jar:2.9.7:compile - version managed from 2.7; omitted for duplicate)
|  \- com.fasterxml.jackson.datatype:jackson-datatype-guava:jar:2.8.7:compile (version managed from 2.4.0)
|     +- (com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile - version managed from 2.5.4; omitted for duplicate)
|     +- (com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile - omitted for duplicate)
|     \- (com.google.guava:guava:jar:16.0:compile - omitted for conflict with 16.0.1)
+- javax.inject:javax.inject:jar:1:compile
+- joda-time:joda-time:jar:2.9.7:compile
+- org.projectlombok:lombok:jar:1.16.14:compile
+- org.springframework.boot:spring-boot-starter-test:jar:1.5.2.RELEASE:test
|  +- org.springframework.boot:spring-boot-test:jar:1.5.2.RELEASE:test
|  |  \- (org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:test - omitted for duplicate)
|  +- org.springframework.boot:spring-boot-test-autoconfigure:jar:1.5.2.RELEASE:test
|  |  +- (org.springframework.boot:spring-boot-test:jar:1.5.2.RELEASE:test - omitted for duplicate)
|  |  \- (org.springframework.boot:spring-boot-autoconfigure:jar:1.5.2.RELEASE:test - omitted for duplicate)
|  +- com.jayway.jsonpath:json-path:jar:2.2.0:test
|  |  +- net.minidev:json-smart:jar:2.2.1:test
|  |  |  \- net.minidev:accessors-smart:jar:1.1:test
|  |  |     \- (org.ow2.asm:asm:jar:5.0.3:test - omitted for duplicate)
|  |  \- (org.slf4j:slf4j-api:jar:1.7.24:test - version managed from 1.7.16; omitted for duplicate)
|  +- junit:junit:jar:4.12:test
|  |  \- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
|  +- (org.assertj:assertj-core:jar:2.6.0:test - omitted for conflict with 3.6.2)
|  +- org.mockito:mockito-core:jar:1.10.19:test
|  |  +- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
|  |  \- org.objenesis:objenesis:jar:2.1:test
|  +- org.hamcrest:hamcrest-core:jar:1.3:test
|  +- org.hamcrest:hamcrest-library:jar:1.3:test
|  |  \- (org.hamcrest:hamcrest-core:jar:1.3:test - version managed from 1.1; omitted for duplicate)
|  +- org.skyscreamer:jsonassert:jar:1.4.0:test
|  |  \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test
|  +- (org.springframework:spring-core:jar:4.3.7.RELEASE:compile - scope updated from test; omitted for duplicate)
|  \- org.springframework:spring-test:jar:4.3.7.RELEASE:test
|     \- (org.springframework:spring-core:jar:4.3.7.RELEASE:test - omitted for duplicate)
+- commons-lang:commons-lang:jar:2.2:compile
+- org.assertj:assertj-core:jar:3.6.2:compile
+- org.mockito:mockito-all:jar:1.10.19:test
+- net.sourceforge.dynamicreports:dynamicreports-core:jar:4.1.1:compile
|  +- net.sf.jasperreports:jasperreports:jar:6.2.2:compile
|  |  +- commons-beanutils:commons-beanutils:jar:1.9.3:compile (version managed from 1.9.0)
|  |  |  \- (commons-collections:commons-collections:jar:3.2.2:compile - omitted for duplicate)
|  |  +- commons-collections:commons-collections:jar:3.2.2:compile
|  |  +- commons-digester:commons-digester:jar:2.1:compile
|  |  |  \- (commons-beanutils:commons-beanutils:jar:1.9.3:compile - version managed from 1.8.3; omitted for duplicate)
|  |  +- commons-logging:commons-logging:jar:1.1.1:compile
|  |  +- com.lowagie:itext:jar:2.1.7.js5:compile
|  |  |  \- bouncycastle:bcprov-jdk14:jar:138:compile
|  |  +- org.jfree:jcommon:jar:1.0.23:compile
|  |  +- org.jfree:jfreechart:jar:1.0.19:compile
|  |  |  \- (org.jfree:jcommon:jar:1.0.23:compile - omitted for duplicate)
|  |  +- org.eclipse.jdt.core.compiler:ecj:jar:4.3.1:compile
|  |  +- (com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile - version managed from 2.1.4; omitted for duplicate)
|  |  +- (com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile - version managed from 2.1.4; omitted for duplicate)
|  |  +- (com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile - version managed from 2.1.4; omitted for duplicate)
|  |  \- com.google.zxing:core:jar:2.3.0:compile
|  +- org.apache.commons:commons-lang3:jar:3.1:compile
|  +- net.sf.barcode4j:barcode4j:jar:2.0:compile
|  |  +- avalon-framework:avalon-framework-impl:jar:4.2.0:compile
|  |  \- xml-apis:xml-apis:jar:1.4.01:compile (version managed from 1.3.04)
|  \- org.apache.xmlgraphics:batik-bridge:jar:1.8:compile
|     +- org.apache.xmlgraphics:batik-anim:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-awt-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-css:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-dom:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-ext:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-parser:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-svg-dom:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-awt-util:jar:1.8:compile
|     |  \- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-css:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-ext:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-dom:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-css:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-ext:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-xml:jar:1.8:compile - omitted for duplicate)
|     |  +- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-ext:jar:1.8:compile
|     |  \- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-gvt:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-awt-util:jar:1.8:compile - omitted for duplicate)
|     |  \- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-parser:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-awt-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-xml:jar:1.8:compile - omitted for duplicate)
|     |  \- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-script:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-anim:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  \- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-svg-dom:jar:1.8:compile
|     |  +- (org.apache.xmlgraphics:batik-awt-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-css:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-dom:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-ext:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-parser:jar:1.8:compile - omitted for duplicate)
|     |  +- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     |  +- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     |  \- (xml-apis:xml-apis-ext:jar:1.3.04:compile - omitted for duplicate)
|     +- org.apache.xmlgraphics:batik-util:jar:1.8:compile
|     +- org.apache.xmlgraphics:batik-xml:jar:1.8:compile
|     |  \- (org.apache.xmlgraphics:batik-util:jar:1.8:compile - omitted for duplicate)
|     +- (xml-apis:xml-apis:jar:1.4.01:compile - version managed from 1.3.04; omitted for duplicate)
|     \- xml-apis:xml-apis-ext:jar:1.3.04:compile
+- org.apache.poi:poi:jar:3.14:compile
|  \- commons-codec:commons-codec:jar:1.10:compile
\- org.apache.poi:poi-ooxml:jar:3.14:compile
   +- (org.apache.poi:poi:jar:3.14:compile - omitted for duplicate)
   +- org.apache.poi:poi-ooxml-schemas:jar:3.14:compile
   |  \- org.apache.xmlbeans:xmlbeans:jar:2.6.0:compile
   |     \- stax:stax-api:jar:1.0.1:compile
   \- com.github.virtuald:curvesapi:jar:1.03:compile

Answer 1

我终于设法解决了这个问题。造成这种情况的原因是我为每个CassandraIterable实例重新实例化MappingCassandraConverter。

public class CassandraIterable<T> implements Iterable<T> {

    private final Iterator<Row> iterator;
    private final Class<T> entityType;

    private final MappingCassandraConverter converter = new MappingCassandraConverter ();

    ...

}

虽然我应该创建一次并将其传递给Iterable：

public class CassandraIterable<T> implements Iterable<T> {


    private final Iterator<Row> iterator;
    private final Class<T> entityType;

    private final MappingCassandraConverter converter;

    public CassandraIterable(Iterator<Row> iterator, Class<T> entityType, MappingCassandraConverter converter) {

        this.iterator = iterator;
        this.entityType = entityType;
        this.converter = converter;
    }

    @Override
    public Iterator<T> iterator() {
        return
                new Iterator<T>() {
                    @Override
                    public boolean hasNext() {
                        return
                                iterator.hasNext();
                    }

                    @Override
                    public T next() {
                        return
                                converter.readRow(entityType, iterator.next());
                    }
                };
    }
}

MappingCassandraConverter不是垃圾收集的（我假设Cassandra会话指向它）并且我的类的访问者可能是转换器所指向的。

我无法找到泄漏的原因是泄漏中没有特定的类型：

由于泄漏，我期待看到我的一种类型在记忆中重复了数百万次。之所以没有发生这样的事实是我的代码中的问题是为Cassandra实体创建了很多访问器，即使只生成了一个类类型。出于这个原因，泄漏中涉及的类是：

并且它们不在列表的顶部，按类型按总大小排序。

Spring Boot应用程序缓慢内存泄漏

1 个答案: