问题
I am getting "java.sql.SQLRecoverableException: Closed Connection", exception while fetching CLOB data from Oracle 11g using Hibernate in java web application. For DB connectivity I have implemented Tomcat 7 dataource.
Below is my source where I am getting an Exception :
java.sql.Clob reqClob= userBean.getRequestData();
Reader clbReader = reqClob.getCharacterStream();
In above Code while executing "clob.getCharacterStream()", I am getting below Exception :
java.sql.SQLRecoverableException: Closed Connection
at oracle.sql.CLOB.getDBAccess(CLOB.java:1389)
at oracle.sql.CLOB.getCharacterStream(CLOB.java:309)
at org.hibernate.lob.SerializableClob.getCharacterStream(SerializableClob.java:41)
Please note that, I am able to get the data from userBean for other values.
Below is the app version I have used in application:
jdk1.6.0_33 (64bit version)
hibernate3.jar
ojdbc6.jar
Oracle 11g 11.2.0.1.0 - (64bit version)
One strange behavior is I am getting this issue once I have started using TOMCAT 7 Datasource.
Below is Datasource code from Context.xml :
<Resource auth="Container" driverClassName="oracle.jdbc.driver.OracleDriver"
factory="oracle.jdbc.pool.OracleDataSourceFactory" name="jdbc/XXXX" password="XXXXX"
type="oracle.jdbc.pool.OracleDataSource"
url="jdbc:oracle:thin:@xx.xx.xx.xxxx:xxxx:xxxxxx" user="username"
connectionProperties="SetBigStringTryClob=true;" maxActive="20"
maxIdle="10" maxWait="-1" validationQuery="select 1 from dual" />
I have tried all possible parameters for in above code, but it didn't work.
Thanks in advance for all your help, guys...
回答1:
I had the same problem today and always when i was calling getSubString
or getCharacterStream
i had the Closed Connection error.
I solved with annotation and removed the Clob type:
@Column(name = "CL_JSON_OUT", nullable = false)
private Clob jsonOut;
to:
@Lob
@Column(name = "CL_JSON_OUT", nullable = false)
private String jsonOut;
This post helped me
回答2:
I had similar problem, I changed Clob to String as below:
String clobAsString = clob.getSubString(1, (int)clob.length());
Make sure you perform this when the connection is alive. Like in DAO. This has to be performed within the transaction which retrieves Clob element from DB.
来源:https://stackoverflow.com/questions/16249238/java-sql-sqlrecoverableexception-while-fetching-clob-data-using-hibernate-orac