Recent Notes
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Created by Fang on February 21, 2012 20:33:58
Last update: February 21, 2012 20:33:58
You can customize Tomcat error page with error code:
<error-page>
<error-code>404</error-code>
...
or Java exception type:
<error-page>
<exception-type>java.lang.Throwab...
Either error-code or exception-type is required, but not both. There's no way to aggregate error codes, such as:
<!-- This does not work! -->
<error-page>
...
Customizing error pages is about the only way to suppress the default stack trace in Tomcat in case of an unhandled exception.
Created by voodoo on February 17, 2012 10:40:43
Last update: February 17, 2012 10:40:43
When a certificate is "untrusted" by IE (such as a self-signed certificate), it displays a "Certificate error" icon next to the address bar. It used to be that you can click on that icon, "View certificates", then install it.
On Windows 7, because of UAC , the "Install Certificate..." button is no longer displayed. In order to see the button, you have to start IE9 with administrator privileges: right click on the IE9 shortcut icon and select " Run as administrator... ".
To save the certificate to a file, click the Details tab on the Certificate dialog, then click " Copy to File... ".
Created by Fang on February 15, 2012 21:11:02
Last update: February 15, 2012 21:11:02
Error:
java.lang.NoClassDefFoundError: org/slf4j/helpers/...
Cause: had slf4j-nop as dependency, but did not have slf4j-api.
Solution: add dependency for slf4j-api.
<dependency>
<groupId>org.slf4j</groupId>
...
Created by Fang on February 15, 2012 21:03:57
Last update: February 15, 2012 21:03:57
Error:
java.lang.NoClassDefFoundError: org/slf4j/impl/Sta...
Soluton: add Maven dependency for one of slf4j-nop , slf4j-simple , slf4j-log4j12 , slf4j-jdk14 . For example:
<dependency>
<groupId>org.slf4j</groupId>
...
or
<dependency>
<groupId>org.slf4j</groupId>
...
org.hibernate.MappingException: An AnnotationConfiguration instance is required to use mapping class
Created by Fang on February 15, 2012 20:52:57
Last update: February 15, 2012 20:52:57
I got this error while using Hibernate 3.5.6:
org.hibernate.MappingException: An AnnotationConfi...
where I used annotations for mapping in the ExampleEntity class.
Problem : I initialized the session factory with Configuration :
sessionFactory = new Configuration()
.co...
Solution : should use AnnotationConfiguration instead:
sessionFactory = new AnnotationConfiguration()
...
Additional Note: Hibernate 4.1 didn't seem to mind ( Configuration worked fine).
Created by voodoo on February 11, 2012 15:02:56
Last update: February 11, 2012 15:04:13
Screenshot:
Details:
W:Failed to fetch copy:/var/lib/apt/lists/partial/...
Solution:
Become root:
$ sudo bash
Goto the apt folder:
# cd /var/lib/apt
Remove (or move) lists:
# rm -r lists
Create new lists folders:
# mkdir -p lists/partial
Retrieve new lists of packages:
# apt-get update
Created by Fang on February 08, 2012 21:21:01
Last update: February 08, 2012 21:21:17
Just a reminder that I got this error when I set the Java system property javax.net.ssl.trustStore to a non-existing file (typo). The full error message when running Maven was:
[ERROR] java.lang.RuntimeException: Unexpected e...
Created by Fang on February 08, 2012 21:15:00
Last update: February 08, 2012 21:15:00
This was the error message:
[ERROR] sun.security.validator.ValidatorExceptio...
The certificate was actually signed by Verisign, but somehow failed to pass Java cert validation.
To resolve the problem:
Download the cert from the server (with RetrieveSSLCert , for example)
Import the certificate into the keystore:
$ keytool -import -trustcacerts -alias myserver -f...
Define MAVEN_OPTS :
$ export MAVEN_OPTS='-Djavax.net.ssl.trustStore=/h...
The quotes must exist for the value of MAVEN_OPTS , and the path must be absolute ( ~/etc/mavenKeyStore.jks does not work).
Created by Dr. Xi on February 06, 2012 09:20:20
Last update: February 06, 2012 09:20:20
This is the error message:
Error 6 initializing SQL*Plus
SP2-0667: Message...
It might be that the ORACLE_HOME environment variable is not properly set or a missing sp1<lang>.msb (for example sp1us.msb ) file. But for my Ubuntu system, there was no such thing as sp1<lang>.msb , and it wasn't caused by a missing ORACLE_HOME . The error was resolved after I restored the shared library file libsqlplusic.so .
Created by James on February 02, 2012 09:20:22
Last update: February 02, 2012 09:20:22
This example came from the jQuery validation documentation. The required rule can be used to validate a required selection box when you set the value of the first option to empty.
<!DOCTYPE HTML>
<html>
<head>
<scrip...
The error message is the title since no error message is specified. A more fully defined validation check would look like this:
$('#my-form').validate({
errorElement: "p",
...
