我正在使用spring data jpa处理应用程序。我正在从Mysql数据库中流式传输~1000000个字段，这些字段在Junit测试容器中正常工作。但是当我使用CommandLineRunner运行相同的逻辑代码时，应用程序在使用以下堆栈跟踪返回~10,000个字段后挂起：
07 Mar 2017 10:49:24 INFO MysqlApplication - Field number: 12172
2017-03-07 10:49:58.340 ERROR 22072 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:803) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:784) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:771) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
at org.cohort.alive.data.facade.mysql.MysqlApplication.main(MysqlApplication.java:21) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_111]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.3.8.RELEASE.jar:1.3.8.RELEASE]
Caused by: java.lang.NullPointerException: null
at com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1045) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5202) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$2.doExtract(VarcharTypeDescriptor.java:73) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:267) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:263) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:253) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:338) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2969) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1696) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1628) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.getRow(Loader.java:1515) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:726) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:696) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.loader.Loader.loadSingleRow(Loader.java:392) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.ScrollableResultsImpl.prepareCurrentRow(ScrollableResultsImpl.java:237) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.ScrollableResultsImpl.next(ScrollableResultsImpl.java:121) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.springframework.data.jpa.provider.PersistenceProvider$HibernateScrollableResultsIterator.hasNext(PersistenceProvider.java:454) ~[spring-data-jpa-1.9.5.RELEASE.jar:na]
at java.util.Iterator.forEachRemaining(Iterator.java:115) ~[na:1.8.0_111]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_111]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[na:1.8.0_111]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[na:1.8.0_111]
at org.cohort.alive.data.facade.mysql.MysqlApplication.run(MysqlApplication.java:35) [classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-1.3.8.RELEASE.jar:1.3.8.RELEASE]
... 11 common frames omitted
2017-03-07 10:49:58.343 INFO 22072 --- [ restartedMain] .b.l.ClasspathLoggingApplicationListener : Application failed to start with classpath: [file:/N:/git/clinical-pipeline/cognitive-nlu/target/classes/]
2017-03-07 10:49:58.343 INFO 22072 --- [ restartedMain] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report enable debug logging (start with --debug)
2017-03-07 10:49:58.343 INFO 22072 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@10086c99: startup date [Tue Mar 07 10:49:16 PST 2017]; root of context hierarchy
2017-03-07 10:49:58.350 INFO 22072 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2017-03-07 10:49:58.352 INFO 22072 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
我很难过，无法理解。如果有人能给我任何指示，真的很感激
编辑（MysqlApplication.java）
public class MysqlApplication implements CommandLineRunner{
public static void main(String[] args) {
SpringApplication.run(MysqlApplication.class, args);
}
@Autowired
BusinessRepository businessRepository;
final static private Logger LOGGER = Logger.getLogger("MysqlApplication");
public void run(String... args) throws Exception {
LOGGER.info("Streaming All....");
Stream<business> concepts = businessRepository.streamAll();
int [] j ={0};
concepts.forEach(i -> {
LOGGER.info("Field Number: "j[0]++");
}
}
编辑2：我认为我通过使用事务性注释应用程序类来解决问题。虽然我不太明白为什么会有所作为。如果有人可以对此有所了解，那就太好了。