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Created by voodoo on February 25, 2011 14:00:41
Last update: February 25, 2011 14:03:46
Suddenly my Windows XP failed to boot with this error message on a blank screen:
missing or corrupt <windows root>\system32\hal.dll I took out the hard drive, put it in a USB enclosure and attached it to another PC. Then I ran CHKDSK and it fixed some file system errors. But I did find that hal.dll was intact, so hal.dll was not missing or corrupt . It turned out that the file that was really missing was C:\boot.ini . It is a hidden file, so you have to use attrib boot.ini to see it. The file is missing if attrib boot.ini returns nothing (run in the root folder C:\). In my case I reconstructed the boot.ini file: [boot loader] timeout=30 default=multi(0)dis... and changed the attributes back...
Created by freyo on February 23, 2011 13:21:12
Last update: February 23, 2011 13:21:12
I tried to convert a private key from PEM to PKCS12 with OpenSSL and got this error:
C:\myworks>openssl pkcs12 -export -in openssl_ca3....
The problem was that the -in parameter expects both private key and certificate in the same input file, i.e., openssl_ca3.pem in the above example. Appending the certificate file to the key fixed the problem:
C:\myworks>cat openssl_ca3.crt >>openssl_ca3.pem
...
Created by magnum on February 15, 2011 14:17:28
Last update: February 15, 2011 14:17:28
I got this error while running Hibernate 3.3.1:
Exception in thread "main" java.lang.IllegalAccess...
Using an earlier version of SLF4J fixed the problem.
Created by nogeek on February 03, 2011 13:08:38
Last update: February 03, 2011 13:14:10
The log line was like this:
2011-01-19 15:16:34,842 INFO [STDOUT] (HDScanne... Note that INFO and timestamp were printed twice. Based on my configuration, I was expecting something like this: 2011-01-19 15:16:34,842 INFO [XmlWebApplicationC... i.e., the logger name should have been XmlWebApplicationContext , not STDOUT ! What was the problem? I found this error message in server.log : 2011-01-19 14:34:38,107 ERROR [STDERR] (main) lo... It turned out that org.apache.log4j.Appender was loaded by my web application class loader, whereas org.jboss.logging.appender.FileAppender was loaded by the JBoss bootstrap class loader. Removing the log4j jar from my web application archive fixed the problem (sine log4j is already available in JBoss). Why was the logger changed to STDOUT? JBoss detects that there's a problem with the log4j configuration and routes all...
Created by Dr. Xi on January 31, 2011 16:14:06
Last update: January 31, 2011 16:14:06
Sometimes ClassCastException happens when apprently a class is casted to the same class or a parent class. The exception looks like this:
java.lang.ClassCastException: X cannot be cast to ... where Y may be the same as X , or a parent class of X . The cause of this error is that X and Y are loaded by different class loaders. You can use the FindClass utility to find all occurances of X and Y in the deployment tree. If there's no duplication of X and Y in the deployment tree, JNDI lookups may be the culprit. Suppose X is loaded by class loader LX and registered under name jndi/Resource . In the context of another loader LY , your code may be looking up...
Created by antoniosanct on January 19, 2011 10:48:09
Last update: January 19, 2011 10:48:09
Same problem using Eclipse 3.6 (WTP 3.2.1) & Windows XP SP3, launching the default server. This fix solves the problem. Thanks a lot!
Created by James on January 10, 2011 16:37:20
Last update: January 10, 2011 16:37:20
The following page injects CSS rules with JavaScript. It works fine in Firefox and Chrome.
<html>
<head>
<script type="text/javascrip...
But in IE, it breaks with "Unknown runtime error" (seemed like it's trying to interpret the curly brackets in the CSS as JavaScript blocks!):
In order to make it work in IE, the code need to be changed to:
<html>
<head>
<script type="text/javascrip...
The tricks to identify IE and insert new CSS rules came from Paul Irish .
Created by voodoo on November 25, 2010 00:03:53
Last update: November 25, 2010 00:03:53
It seems that the JDBC standard way to create a BLOB is to call Connection.createBlob . However, this does not work for PostgreSQL (as of version 9.0-801 jdbc4):
Exception in thread "main" org.postgresql.util.PSQ...
The workaround is to call a PostgreSQL function to create the Blob, then use JDBC to update it:
Connection conn = jdbcTemplate.getDataSource().get...
Oracle Note: the Oracle way function to create an empty BLOB is EMPTY_BLOB() .
stmt.execute ("INSERT INTO my_blob_table VALUES ('...
Created by voodoo on November 24, 2010 23:34:52
Last update: November 24, 2010 23:36:08
PostgreSQL provides two distinct ways to store binary data: Binary data can be stored in a table using the data type bytea . By using the Large Object feature which stores the binary data in a separate table in a special format and refers to that table by storing a value of type oid in your table. Different methods are used to access the BLOBs depending on which storage type you choose: To use the bytea data type you should use the getBytes() , setBytes() , getBinaryStream() , or setBinaryStream() methods. To use the Large Object functionality you can use either the LargeObject class provided by the PostgreSQL JDBC driver, or by using the getBLOB() and setBLOB() methods. Using setBinaryStream on an OID column yields...
Created by voodoo on November 20, 2010 00:08:16
Last update: November 20, 2010 00:09:13
This error occurred when I try to use the Perl DBD module for PostgreSQL:
This is the solution:
Copy the file Pg.dll.manifest from perl/site/lib/auto/DBD/Pg/ to perl/bin/ .
Rename the manifest file perl.exe.manifest .
