H2 - 一般错误:"java.lang.NullPointerException"[50000-182]

Question

我有一个非常大(> 2.5 GB)的h2数据库文件.驱动程序版本为1.4.182.一切正常,但最近数据库停止工作异常:

B??d ogólny: "java.lang.NullPointerException"
General error: "java.lang.NullPointerException" [50000-182] HY000/50000 (Help)
org.h2.jdbc.JdbcSQLException: B??d ogólny: "java.lang.NullPointerException"
General error: "java.lang.NullPointerException" [50000-182] 
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:345) 
    at org.h2.message.DbException.get(DbException.java:168) 
    at org.h2.message.DbException.convert(DbException.java:295) 
    at org.h2.engine.Database.openDatabase(Database.java:297) 
    at org.h2.engine.Database.<init>(Database.java:260) 
    at org.h2.engine.Engine.openSession(Engine.java:60) 
    at org.h2.engine.Engine.openSession(Engine.java:167) 
    at org.h2.engine.Engine.createSessionAndValidate(Engine.java:145) 
    at org.h2.engine.Engine.createSession(Engine.java:128) 
    at org.h2.engine.Engine.createSession(Engine.java:26) 
    at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:347) 
    at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:108) 
    at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:92) 
    at org.h2.Driver.connect(Driver.java:72) 
    at org.h2.server.web.WebServer.getConnection(WebServer.java:750) 
    at org.h2.server.web.WebApp.test(WebApp.java:895) 
    at org.h2.server.web.WebApp.process(WebApp.java:221) 
    at org.h2.server.web.WebApp.processRequest(WebApp.java:170) 
    at org.h2.server.web.WebThread.process(WebThread.java:137) 
    at org.h2.server.web.WebThread.run(WebThread.java:93) 
    at java.lang.Thread.run(Thread.java:722) 
Caused by: java.lang.NullPointerException 
    at org.h2.mvstore.db.ValueDataType.compare(ValueDataType.java:102) 
    at org.h2.mvstore.MVMap.compare(MVMap.java:741) 
    at org.h2.mvstore.Page.binarySearch(Page.java:388) 
    at org.h2.mvstore.MVMap.put(MVMap.java:179) 
    at org.h2.mvstore.MVMap.put(MVMap.java:133) 
    at org.h2.mvstore.db.TransactionStore.rollbackTo(TransactionStore.java:491) 
    at org.h2.mvstore.db.TransactionStore$Transaction.rollback(TransactionStore.java:785) 
    at org.h2.mvstore.db.MVTableEngine$Store.initTransactions(MVTableEngine.java:223) 
    at org.h2.engine.Database.open(Database.java:736) 
    at org.h2.engine.Database.openDatabase(Database.java:266) 
... 17 more 

问题出现在我的应用程序中并使用H2 Web前端.我尝试过类似问题的解决方案,但我无法将H2降级到1.3.x,因为它无法读取1.4.x DB文件.

我的问题是:

怎么处理？是否有可能让它再次发挥作用？我已经尝试将H2降级到1.4.177,但它没有帮助.

有没有办法至少将数据恢复到其他格式？我可以使用其他DB(Sqlite等)但是我需要一种方法来获取这些数据.

编辑:更新的堆栈跟踪

编辑2:使用恢复工具的结果:

$ java -cp h2-1.4.182.jar org.h2.tools.Recover
Exception in thread "main" java.lang.IllegalStateException: Unknown tag 50 [1.4.182/6]
   at org.h2.mvstore.DataUtils.newIllegalStateException(DataUtils.java:762)
   at org.h2.mvstore.type.ObjectDataType.read(ObjectDataType.java:222)
   at org.h2.mvstore.db.TransactionStore$ArrayType.read(TransactionStore.java:1792)
   at org.h2.mvstore.db.TransactionStore$ArrayType.read(TransactionStore.java:1759)
   at org.h2.mvstore.Page.read(Page.java:843)
   at org.h2.mvstore.Page.read(Page.java:230)
   at org.h2.mvstore.MVStore.readPage(MVStore.java:1813)
   at org.h2.mvstore.MVMap.readPage(MVMap.java:769)
   at org.h2.mvstore.Page.getChildPage(Page.java:252)
   at org.h2.mvstore.MVMap.getFirstLast(MVMap.java:351)
   at org.h2.mvstore.MVMap.firstKey(MVMap.java:218)
   at org.h2.mvstore.db.TransactionStore.init(TransactionStore.java:169)
   at org.h2.mvstore.db.TransactionStore.<init>(TransactionStore.java:117)
   at org.h2.mvstore.db.TransactionStore.<init>(TransactionStore.java:81)
   at org.h2.tools.Recover.dumpMVStoreFile(Recover.java:593)
   at org.h2.tools.Recover.process(Recover.java:331)
   at org.h2.tools.Recover.runTool(Recover.java:192)
   at org.h2.tools.Recover.main(Recover.java:155)

我还注意到已经创建了另外两个文件(.txt和.sql),但它们似乎不包含数据.

Answer 1

我上周用JIRA数据库得到了相同的情况,我花了几个小时去做谷歌关于这个问题但是,没有答案可以解决这个问题.

我决定看看H2源代码,我可以用非常简单的代码恢复整个数据库.我可能无法理解有关情况的全貌,例如根本原因,它发生在哪种情况等等.但原因是:当你连接到h2文件时,H2引擎会查看auditLog并回滚正在进行的事务,有一些具有未知类型的数据(id为17)并且H2在识别类型(id 17)期间由于异常而无法回滚.

我的代码很简单,在构建路径中添加h2 lib然后只需手动连接到文件并清除auditLog,因为我认为它只是日志而且不会产生很大的影响(有人可能会纠正我).希望您也可以解决您的问题.

public static void main(final String[] args) {
    // open the store (in-memory if fileName is null)
    final MVStore store = MVStore.open("C:\\temp\\h2db.mv.db");

    final MVMap<Object, Object> openMap = store.openMap("undoLog");

    openMap.clear();

    // close the store (this will persist changes)
    store.close();
}