SpringBootTest DBFactory open error

[songlongkuan]

service :

@Service
@Slf4j
public class LevelCacheStore extends StringCacheStore {
    private String folderPath;

    /**
     * Cleaner schedule period. (ms)
     */
    private final static long PERIOD = 60 * 1000;

    private DB leveldb;

    private Timer timer;



    @PostConstruct
    public void init() {

        try {
            this.folderPath = "~/.halo/leveldb/";
            System.out.println("folder:" + folderPath);
            File folder = new File(this.folderPath);
            folder.mkdirs();
            DBFactory factory = new Iq80DBFactory();
            Options options = new Options();
            options.createIfMissing(true);
            //folder 是db存储目录
            leveldb = factory.open(folder, options);
            timer = new Timer();
            timer.scheduleAtFixedRate(new CacheExpiryCleaner(), 0, PERIOD);
        } catch (Exception ex) {
            ex.printStackTrace();
            log.error("run leveldb error ", ex);
        }
    }

run SpringBootTest error:

java.nio.channels.OverlappingFileLockException: null
	at sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java:255) ~[na:1.8.0_144]
	at sun.nio.ch.SharedFileLockTable.add(FileLockTable.java:152) ~[na:1.8.0_144]
	at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1108) ~[na:1.8.0_144]
	at java.nio.channels.FileChannel.tryLock(FileChannel.java:1155) ~[na:1.8.0_144]
	at org.iq80.leveldb.impl.DbLock.<init>(DbLock.java:47) ~[leveldb-0.12.jar:0.12]
	at org.iq80.leveldb.impl.DbImpl.<init>(DbImpl.java:169) ~[leveldb-0.12.jar:0.12]
	at org.iq80.leveldb.impl.Iq80DBFactory.open(Iq80DBFactory.java:83) ~[leveldb-0.12.jar:0.12]
	at run.halo.app.cache.LevelCacheStore.init(LevelCacheStore.java:61) ~[main/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:389) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:333) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:157) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1795) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) [spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]

[Dain Sundstrom]

It looks like this code is attempting to open the database twice within the same JVM. The database should only be opened once and shared across threads.

[songlongkuan]

Thank you