Java 访问HSQLDB数据库时发生NullPointerException

我正在通过java程序中的jdbc驱动器访问HSQLDB。数据库的脚本文件如下所示

CREATE SCHEMA PUBLIC AUTHORIZATION DBA

CREATE CACHED TABLE TBL1(ID CHAR(5),NAME VARCHAR(11),ZIP VARCHAR(11))

CREATE UNIQUE INDEX IDX_ID ON TBL1(ID)

CREATE CACHED TABLE TBL2(ID CHAR(5),STREET CHAR(5))

CREATE INDEX IDX_RS_ID ON TBL2(ID)

CREATE CACHED TABLE TBL3(ID VARCHAR(8) NOT NULL PRIMARY KEY,LON FLOAT,LAT FLOAT)

CREATE GLOBAL TEMPORARY MEMORY TABLE OVERLAY(ID CHAR(8),AROUTE CHAR(10),ZROUTE 

CHAR(10),TYPE CHAR(8)) ON COMMIT PRESERVE ROWS

SET TABLE TBL1 INDEX'4490648 5643624 0'

SET TABLE TBL2 INDEX'529105280 529105280 0'

SET TABLE TBL3 INDEX'775814624 0'

CREATE VIEW OVERLAYSPAN (ID,STREET) AS SELECT DISTINCT ID, NAME FROM OVERLAY AS O, TBL2 as 
R WHERE O.ID = R.ID

CREATE USER SA PASSWORD ""

GRANT DBA TO SA

SET WRITE_DELAY 10

在java程序中，我首先从TBL1中删除所有条目1000个条目，然后在同一个表中重新插入新条目1500个。程序正常执行，但是，当我试图重新执行同一程序时，出现以下错误

java.sql.SQLException: error in script file line: 9 S1000 General error 

java.lang.NullPointerException in statement [SET TABLE TBL2 INDEX'529105280 529105280 0']

这是程序中的填充堆栈跟踪

java.sql.SQLException: error in script file line: 9 S1000 General error java.lang.NullPointerException in statement [SET TABLE TBL2 INDEX'529105280 529105280 0']
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source)
at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at HSQLTesting.main(HSQLTesting.java:98)

知道这里出了什么问题吗

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提前谢谢。

您能分享完整的堆栈跟踪吗？我感觉NPE是由另一个异常引起的。你可以用堆栈跟踪编辑你现有的问题。你刚刚发布的那篇文章并没有说明全部情况。您是否有可能在完整堆栈跟踪中看到java内存不足错误？没有，我在堆栈跟踪中没有看到java内存不足错误。

Connection sqlconnect = DriverManager.getConnection("jdbc:hsqldb:file:C:/birdseyedb/birdseye", "SA", "");