DatabaseMetaData and HTTP connections
wcydaip Feb 27, 2007 5:14 PMHi,
I began working with the con.getMetaData() object today and soon after began getting the following:
org.jboss.deployment.DeploymentException: Too many open files; - nested throwable: (java.io.IOException: Too many open files) at org.jboss.web.AbstractWebContainer.init(AbstractWebContainer.java:352) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118) at org.jboss.mx.server.Invocation.invoke(Invocation.java:74) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127) at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:80) at org.jboss.mx.server.Invocation.invoke(Invocation.java:74) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176) at $Proxy31.init(Unknown Source) at org.jboss.deployment.MainDeployer.init(MainDeployer.java:843) at org.jboss.deployment.MainDeployer.init(MainDeployer.java:863) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:780) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:753) at sun.reflect.GeneratedMethodAccessor54.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118) at org.jboss.mx.server.Invocation.invoke(Invocation.java:74) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127) at org.jboss.mx.server.Invocation.invoke(Invocation.java:74) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176) at $Proxy9.deploy(Unknown Source) at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:319) at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:489) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:192) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:203) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:182) Caused by: java.io.IOException: Too many open files at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.<init>(FileInputStream.java:106) at org.jboss.web.AbstractWebContainer.init(AbstractWebContainer.java:301) ... 37 more
Anyone know the cause?
Here's the code which causes the problem:
public DbTable getTable(String ds, String tbl) throws SQLException, NamingException, LookupException{ DbTable table = null; Connection con = null; ResultSet rs = null; DatabaseMetaData meta = null; String[] types = {"TABLE"}; try { con = AppHelper.getConnection(ds); meta = con.getMetaData(); rs = meta.getTables(con.getCatalog(), null, "%"+tbl+"%", types); if(!rs.next()) { throw new LookupException("Unable to find specified table:"+tbl); } String name; int count = 3; do { name = rs.getString(count); if(name.equals(tbl)) { table = new DbTable(name); readTableColumns(meta, table); break; } }while(rs.next()); }finally { AppHelper.closeResultSet(rs); AppHelper.releaseConnection(con); } return table; } private void readTableColumns(DatabaseMetaData meta, DbTable table) throws SQLException { logger.info("entering readTableColumns"); ResultSet columns = meta.getColumns(null, "%", table.getTableName(), "%"); while (columns.next()) { String columnName = columns.getString("COLUMN_NAME"); String datatype = columns.getString("TYPE_NAME"); int datasize = columns.getInt("COLUMN_SIZE"); int digits = columns.getInt("DECIMAL_DIGITS"); int nullable = columns.getInt("NULLABLE"); boolean isNull = (nullable == 1); DbColumn newColumn = new DbColumn(columnName, datatype, datasize, digits, isNull); table.addColumn(newColumn); } logger.info("leaving readTableColumns"); }