In standalone java project (main method) if you insert / update database it will not work. It is because you need to add the transaction management. You need to do programmatic transaction management. Here is the code you need to add in your main method.
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Archive for the 'Java' category
Managing Java Memory – heap size, max perm size, GC collection etc.,
1. –Xms512m and –Xmx2048m
Define the minimum and maximum heap space.
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WebTest using https – javax.net.ssl.SSLHandshakeException
Add to the webtest
<config useInsecureSSL="true" />SEO friendly URL’s in Java
If the application is open to all general Internet users, then it is almost mandatory to generate SEO friendly URLs, not just for e.g., the product URL but also the search results page in your application.
Java – Logging in high volume transactions
Logging involves disk IO. I have run tests and in some cases logging affected the response time and in some cases I did not. However this is not about how logging affects response time.
SAXParserFactoryImpl not found Error
Problem:
[java] 2010-10-08 11:29:36.273:WARN::FAILED HandlerCollection@79a2e7: javax.xml.parsers.FactoryConfigurationError: Provider o
rg.apache.xerces.jaxp.SAXParserFactoryImpl not found
[java] 2010-10-08 11:29:36.273:WARN::Error starting handlers
[java] javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
[java] at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:113)
[java] at org.eclipse.jetty.xml.XmlParser.<init>(XmlParser.java:68)
Generate environment specific properties file using ant replace
If you want create your config file specific to each environment, then you could take the following approach. Assuming your environment specific properties are kept in folder structure as in the image.
com.sun.tools.javac.Main is not on the classpath
I get the following error when I run ant script.
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to “d:\devtools\java1.5\jre”
Setting up JackRabbit with Database
There are not many resources on the net that shows how to setup up JackRabbit with database. At least I couldn’t find it. There are many reasons you would want to choose to implement the storage in database rather than file system. Well I’m not going to talk about that here. You read an interesting discussion on TheServerSide.
Delete more than one table
String query = "show tables like 'a%'"; String tables = null; try { Statement st = conn.createStatement(); ResultSet rs = st.executeQuery(query); while (rs.next()) { String tableName= rs.getString(1); if (tables == null) tables = tableName; else tables += "," + tableName; } st.close(); st = conn.createStatement(); st.executeUpdate("drop table " + tables); st.close(); } catch (SQLException e) { System.out.println("Unable to execute Query " + e.getMessage()); }