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Not able to start the Hibernate DB server.

 
rahul deo
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Hi
I am new to Hibernate. I have downloaded hsqldb.zip file. I have added hsqldb.jar in build path of application and tried to run this file and getting below as an exception. Please help.


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

/**
* Title: Testdb
* Description: simple hello world db example of a
* standalone persistent db application
*
* every time it runs it adds four more rows to sample_table
* it does a query and prints the results to standard out
*
* Author: Karl Meissner karl@meissnersd.com
*/
public class Testdb {

Connection conn; //our connnection to the db - presist for life of program

// we dont want this garbage collected until we are done
public Testdb(String db_file_name_prefix) throws Exception { // note more general exception

// Load the HSQL Database Engine JDBC driver
// hsqldb.jar should be in the class path or made part of the current jar
Class.forName("org.hsqldb.jdbcDriver");

// connect to the database. This will load the db files and start the
// database if it is not alread running.
// db_file_name_prefix is used to open or create files that hold the state
// of the db.
// It can contain directory names relative to the
// current working directory
conn = DriverManager.getConnection("jdbc:hsqldb:"
+ db_file_name_prefix, // filenames
"sa", // username
""); // password
System.out.println(conn);
}

public void shutdown() throws SQLException {

Statement st = conn.createStatement();

// db writes out to files and performs clean shuts down
// otherwise there will be an unclean shutdown
// when program ends
st.execute("SHUTDOWN");
conn.close(); // if there are no other open connection
}

// use for SQL command SELECT
public synchronized void query(String expression) throws SQLException {

Statement st = null;
ResultSet rs = null;

st = conn.createStatement(); // statement objects can be reused with

// repeated calls to execute but we
// choose to make a new one each time
rs = st.executeQuery(expression); // run the query

// do something with the result set.
dump(rs);
st.close(); // NOTE!! if you close a statement the associated ResultSet is

// closed too
// so you should copy the contents to some other object.
// the result set is invalidated also if you recycle an Statement
// and try to execute some other query before the result set has been
// completely examined.
}

// use for SQL commands CREATE, DROP, INSERT and UPDATE
public synchronized void update(String expression) throws SQLException {

Statement st = null;

st = conn.createStatement(); // statements

int i = st.executeUpdate(expression); // run the query

if (i == -1) {
System.out.println("db error : " + expression);
}

st.close();
} // void update()

public static void dump(ResultSet rs) throws SQLException {

// the order of the rows in a cursor
// are implementation dependent unless you use the SQL ORDER statement
ResultSetMetaData meta = rs.getMetaData();
int colmax = meta.getColumnCount();
int i;
Object o = null;

// the result set is a cursor into the data. You can only
// point to one row at a time
// assume we are pointing to BEFORE the first row
// rs.next() points to next row and returns true
// or false if there is no next row, which breaks the loop
for (; rs.next(); ) {
for (i = 0; i < colmax; ++i) {
o = rs.getObject(i + 1); // Is SQL the first column is indexed

// with 1 not 0
System.out.print(o.toString() + " ");
}

System.out.println(" ");
}
} //void dump( ResultSet rs )

public static void main(String[] args) {

Testdb db = null;

try {
db = new Testdb("db_file");
} catch (Exception ex1) {
ex1.printStackTrace(); // could not start db

return; // bye bye
}

try {

//make an empty table
//
// by declaring the id column IDENTITY, the db will automatically
// generate unique values for new rows- useful for row keys
db.update(
"CREATE TABLE sample_table ( id INTEGER IDENTITY, str_col VARCHAR(256), num_col INTEGER)");
} catch (SQLException ex2) {

//ignore
//ex2.printStackTrace(); // second time we run program
// should throw execption since table
// already there
//
// this will have no effect on the db
}

try {

// add some rows - will create duplicates if run more then once
// the id column is automatically generated
db.update(
"INSERT INTO sample_table(str_col,num_col) VALUES('Ford', 100)");
db.update(
"INSERT INTO sample_table(str_col,num_col) VALUES('Toyota', 200)");
db.update(
"INSERT INTO sample_table(str_col,num_col) VALUES('Honda', 300)");
db.update(
"INSERT INTO sample_table(str_col,num_col) VALUES('GM', 400)");

// do a query
db.query("SELECT * FROM sample_table WHERE num_col < 250");

// at end of program
db.shutdown();
} catch (SQLException ex3) {
ex3.printStackTrace();
}
} // main()
}



Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at Testdb.<init>(Testdb.java:28)
at Testdb.main(Testdb.java:124)



Thanks in advance.
 
Christian Dillinger
Ranch Hand
Posts: 195
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That's not Hibernate. That's pure JDBC. The error tells you, that your class-File is "newer" than your version of java.exe. Seems you are trying to run an application compiled with (e.g.) Java 6 on a Java 5 JVM. Or Java 7 on JVM 6.
 
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