rpm command – can’t create transaction lock
In case if you are getting error on running rpm command e.g.
$ rpm -e jdk-wrapper-1.5.0_15-1.gdg.noarch error: can't create transaction lock on /var/lib/rpm/__db.000
javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS
I am getting exception while sending mail using JavaMail APIs. Mail properties are as
mail.transport.protocol = smtp mail.smtp.host = mailHost mail.smtp.port = 25 mail.smtp.auth = true
The exception I am getting while sending email
Exception in thread "main" javax.mail.SendFailedException: Sending failed;
nested exception is:
javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first m1sm949464nzf
at javax.mail.Transport.send0(Transport.java:219)
at javax.mail.Transport.send(Transport.java:81)
at example.SendMailUsingAuthentication.postMail(SendMailUsingAuthentication.java:77)
at example.SendMailUsingAuthentication.main(SendMailUsingAuthentication.java:35)
Error in setting up Quartz (Spring framework)
'org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.scheduling.quartz.SchedulerFactoryBean' defined in ServletContext resource [/WEB-INF/tvp-job.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javax/transaction/UserTransaction Caused by: java.lang.NoClassDefFoundError: javax/transaction/UserTransaction at org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:1104) at org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:1355) at org.springframework.scheduling.quartz.SchedulerFactoryBean.createScheduler(SchedulerFactoryBean.java:687) at org.springframework.scheduling.quartz.SchedulerFactoryBean.afterPropertiesSet(SchedulerFactoryBean.java:582) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1203) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)
java.sql.SQLException: Closed Connection
Caused by: java.sql.SQLException: Closed Connection: next at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:185) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:610) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:584) at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:101) at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:78) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
Installing mysql in linux
To install mysql type following command in terminal
$ sudo apt-get install mysql-server
When installation is done, you may want to setup password for root
sudo mysqladmin -u root -h localhost password 'test' sudo mysqladmin -u root -h hostname password 'test'
Replace hostname and ‘test’ with your actually hostname and desired
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What is Boundary Value Analysis?
Boundary value analysis is defining the input-output of a system for extreme cases. For example if the specification for a text field on a web page is to accept numbers from 1 to 99 then boundary value analysis will include inputs near 1 (-1, 0. 1.1 etc) and near 99 (98, 99.5 and 100 etc.)
Installing tomcat in ubuntu/linux
Download tomcat from http://tomcat.apache.org
Go to the directory where you have downloaded apache-tomcat-6.0.18.tar.gz
$ cd $ tar xvzf apache-tomcat-6.0.14.tar.gz
Move tomcat to ~/opt directory
sudo mv apache-tomcat-6.0.18 ~/opt/tomcat
Now you can start tomcat by executing startup.sh script located in tomcat/bin directory.
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What is Equivalence Partitioning?
Equivalence Partitioning is defining sets of input-output for a system and each of such sets is called an equivalence partition.
Installing eclipse in ubuntu/linux
Download eclipse from http://www.eclipse.org/downloads/
Make an opt directory in user’s home directory
$ mkdir ~/opt
Go to the directory where you have downloaded eclipse
$ tar -xvf eclipse-SDK-3.4.1-linux-gtk.tar.gz && mv eclipse ~/opt
Make a bin folder in user’s home directory
$ mkdir ~/bin
Next create an executable for Eclipe at ~/bin/eclipse
$ vi ~/bin/eclipse
Add the following lines in this file
export MOZILLA_FIVE_HOME="/usr/lib/mozilla/" export ECLIPSE_HOME="$HOME/opt/eclipse" $ECLIPSE_HOME/eclipse $*
Finally make script executable
$ chmod +x ~/bin/eclipse
You can now execute that file to start up Eclipse.
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Installing JDK in ubuntu/linux
To install jdk6.0 type the following command in terminal window
$ sudo apt-get install sun-java6-jdk
Provide password for root. It will show you agreement. Select and wait for installation to be completed.
We should set JAVA_HOME environment variable after successful installation of jdk.
$ vi ~/.bashrc
Insert following line in above file
export JAVA_HOME=/usr/lib/jvm/java-6-sun