I was trying to deploy my Ear containing a war file in Weblogic 8.1, got the following exception
java.lang.NoSuchMethodError: weblogic.servlet.jsp.StandardTagLib.fakeEmptyBodyTag(Ljavax/servlet/jsp/PageContext;Ljavax/servlet/jsp/tagext/BodyTag;IZ)V
at jsp_servlet._login.__login._jspService(__login.java:1016)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:431)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.pearson.ph.phcore.presentation.servlets.CheckLoginFilter.doFilter(CheckLoginFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.pearson.ph.phcore.presentation.servlets.CheckLoginFilter.doFilter(CheckLoginFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.pearson.ph.itext.presentation.servlets.SessionFilter.doFilter(SessionFilter.java:87)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6297)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:97)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3575)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2573)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:178)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:151)
Solution
Seems this is an issue with Weblogic server 8.1, when upgraded to Weblogic 8.1 sp4 the problem goes away.
Written by Ravi Nallakukkala on April 18th, 2007 with no comments.
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This is one of those plug-in which a developer would love to have in the development environment, the main purpose of this plug-in is report the time taken to execute a JUnit.
Highlights (release 0.4)
- Reports the time taken for the execution of each test method, typically the results are displayed in as shown below.
Usage
- Upon running a JUnit test class, this plug-in gets invoked automatically.
Favorable
- Great reports in development environment, no need for any extra profiling.
Unfavorable
- This plug-in doesn’t integrate with Fireworks plug-in (through which you can run a test suite)
For more information about this tool, IntelliJ plug-in repository here and user documentation here
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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A tool for creating JUnit tests (class/ methods).
Highlights (based on release 0.303)
- Extremely easy to use, very well documented.
- You can create your own location patterns for the Test class to be created.
Usage
- On a class or method press Ctrl-T (in Ariadna) Ctrl-Shift-T (in Aurora) to go to the test class or test method
- On a test class or test method press Ctrl-T/Ctrl-Shift-T to go back to the tested class or tested method
- If the test class or test method is missing it will be automatically created.
Favorable
- Easy of use and integrates well with IntelliJ
- You have more control on the location of the created test classes.
- Very good documentation.
- Toggle between the code and test using CTRL + SHIFT + T
- This plug-in along with fireworks plug-in should be good fit.
Unfavorable
- Not an Intelligent to analysis the code and write some test cases.
For more information on this tool here and User guide available here
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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Found a good discussion on IBM site; but remember this is a discussion in 2003 things could have changed by now
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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This is a plugin meant for running all JUnits as a single test suite.
Highlights
- Runs with JUnit 3.8 and 4.
- Helps in Run all the JUnits together (as a single test suite) based on a regular expression (e.g, *test).
Usage
- Goto fireworks tab and select run (ALT + SHIFT +K).
Favorable
- Helps to run all the JUnit together and Integrates with IntelliJ
Unfavorable
NA
For more information on this tool here.
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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Continuing the quest for a JUnit generator tool, my next stop was with JUnit Generator – IntelliJ Plugin. Lets look at features and the fitments of this tool towards my requirement (Junit Generation for a given source code).
Highlights (based on 1.1.7 release)
- Generates JUnit test classes/methods for all the public source methods .
- The generated JUnit code is not complaint with JUnit 4.
- Easy of Installation/ usage.
Usage
- Open the file for which you need to write the JUnit test class, select Alt+Insert you will see “JUnit Test” menu in the list.
Favorable
- Auto generates the skeleton code for JUnit test class.
- Integrates with IntelliJ
Unfavorable
- Only the Skeleton code is generated.
- If the JUnit already existing, For an Existing JUnit IntelliJ (6.0.5 build #6180) throws an Internal error instead of showing the differences in the current JUnit code to generated code as promised by the tool
For more information about this tool, go from here
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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I started a searching for a free tool (which hopefully) will generated some JUnit test code for a given source code. In process of this search, as a first start point I started evaluating the plug-ins which are available for IntelliJ; JUnit 4 Synchronizer is my first stop in the evaluation process.
Highlights (based on release 0.1.1)
- Generates Skeleton JUnit Code.
- Generates JUnit 4 test classes/methods for source methods annotated with the @Testable annotation.
Usage
- From IntelliJ IDE, Tools –> RunSynchronize JUnit Tests, this creates a @Testable annotation
- All the desired source methods needs to be Annotate with @Testable annotation.
- Run Synchronize JUnit Tests to create test methods.
- Repeat steps 2 and 3 as often as desired to create new unit tests
Favorable
- Auto generates the skeleton code for JUnit test class.
- Integrates with IntelliJ
Unfavorable
- Source code needs to have test Annotations in the source code. In other words, Source code has dependency on test code (as @Testable annotation is available in ‘test’ folder).
- Only the Skeleton code is generate
For more information about the plugin, go here
Written by Ravi Nallakukkala on April 16th, 2007 with no comments.
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A common source for bugs while writing code Business Objects for relational database using Object Relation Mapping tools is the implementation of the Equals and Hashcode methods.
If you would like to know more about the Equals and Hashcode importance for an ORM Click here.
To summarize the ORM implementation, There are two types of keys: Technical Keys and Business keys.
Technical keys are the primary key on the for a table to uniquely identify a database row, these numbers are auto generated sequence number (Item Unique IDentification/ IUID).
Business keys are the Business primary (/ composite) keys which uniquely identify the business objects in the database tables.
One of the important factor while writing a equals and hashcode method is to decide on what attributes needs to go into these methods; Some guidelines for deciding the attributes for Equals and hashcode methods.
- It is not necessary to cover all the attributes in Business Objects in equals/ hashcode methods.
- Include the Technical Keys and Business keys in equals and hashcode methods.
- Equals and hashcode methods should take care of the null cases.
Implementation wise, Apache commons-lang has a very good implementation for hashcode and equals method. Here’s an example of equals and hashcode methods using the apache commons-lang.
@Entity
@Table(name = "APP_CONFIGURATION")
@SequenceGenerator(name = "OPS_SEQ", sequenceName = "SQ_CONFIGURATION_CNTR")
public class ConfigurationBo extends AbstractBo {
private static final long serialVersionUID = -5098377177228374794L;
@Column(name = “ITEMNAME”, length = 100)
private String name;
@Column(name = “STRINGVALUE”, length = 100)
private String stringValue;
@Column(name = “INTVALUE”)
private Integer intValue;
@Column(name = “TYPENAME”, length = 20)
private String type;
public Integer getIntValue() {
return intValue;
}
public void setIntValue(Integer intValue) {
this.intValue = intValue;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getStringValue() {
return stringValue;
}
public void setStringValue(String stringValue) {
this.stringValue = stringValue;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj.getClass() == this.getClass())) {
return false;
}
ConfigurationBo other = (ConfigurationBo) obj;
return new EqualsBuilder()
.appendSuper(super.equals(obj))
.append(this.name, other.name)
.append(this.type, other.type)
.isEquals();
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return new HashCodeBuilder()
.appendSuper(super.hashCode())
.append(this.name)
.append(this.type)
.toHashCode();
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return super.toString() + “[name=” + name + “, type=” + type + “]”;
}
}
Written by Ravi Nallakukkala on April 15th, 2007 with 4 comments.
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It been long time that i had got an opportunity to demonstrate my driving skills on road, and was memorizing when did I had a good test for my good driving skills, the first thing that comes to my mind is a drive from Atlanta to Birmingham.
Let me give my driving background first, I’m always fascinated by Cars and a great fan of Formula 1 and in particular to Michael Schumacher and Ferrari. I’m used for driving manual gear cars with a drive on right side, mostly driven in Asia and United kingdom where traffic is considerable good, when moved to states, needed to drive a automated gear cars, not much of traffic on streets, cars hasa left drive (rigth traffic), to make life even difficult very polite drivers , low seep limits on a good roads and photo enforcement in most of the places 
Sometime back I was working in Atlanta, GA, the one place where I love to drive. Here most of the traffic drives is very very aggressively. I’m a frequent visitor to Phoenix, AZ; so any guess how does Birmingham come into picture? Yes its because of Southwest airlines. Couple of times I had to pickup my flight from Birmingham, according to maps, the drive time between the two places should be approximately to 2 hours 20Min’s (around 150 miles). After driving for a while a in Atlanta, thought its an 1 hr and 40Min’s drive and having obtained a boarding card, ideally a door to door of 2 hours and 30 - 40 min’s is an ideal time for drive (need to be a bit careful in time calculations, Alabama is in CST and Georgia in EST).
Already, I missed couple of factors,
- I’m starting my drive on a Friday afternoon 2pm (weekend traffic).
- Any road works?
The drive from Atlanta to Birmingham is on I20 from east to west; for most part of the freeway official speed-limit is 75miles/ hour. Every time I had driven from Atlanta to Birmingham, it was definitely never without action, excitement!
My Trip to Birmingham started on a bad note, Got stuck in traffic in Atlanta Just before I could enter I 20 freeway, It was a delay of 6Min’s, was getting nervous as I knew I’m on road which I have no knowledge about, and that’s the last southwest flight from Birmingham to Phoenix; so pretty much knew what should I do if I miss my flight . Once Entered into I 20, well its all mine, Friday traffic was there, but as long as I was in Georgia, the whole traffic moves at a higher speed so no real problems till 50miles, all of sudden a “Work Zone” sign for next 6miles; hmm getting interesting drove about a mile at reduced speed, then another surprise, slow traffic and eventually no movement in the car (may be 10feet) for 25 minutes, totally frustrated, saw a small gap in front of me, so moved around 3feet, here you goo….bang!!! its from the back, someone hit me from back! hmm stopped the car to check the damage, a small dent and its was a old lady driver who expressed her apology, considering time constraints immediately back to car; after 40 Min’s of near stand still situation, suddenly found my car running at 40miles/hour then slowly to hitting the speed limit on the road, car speed limit slow traffic, a quick mathematics says I need an “average speed” of 80miles + 10-15minutes for car parking and security + boarding (Assumption was Birmingham is a small airport). May times, was revisiting my decision, would it be good to return back ? but same time wanna to give a try.
The opportunity to test driving skill was presented to me in a most beautiful way, drove to the potential of my car for next 50miles, the expected average speed was so high that my speed is not making any significant impact on the overall time, so complete 100miles; here comes another surprise, “work zone next 6miles”, hmm I don’t remember if I had followed the speed limits, but mostly it was a empty work zone roads! after that its all driving on I20 in a deep forests no sharp turns and not many narrow roads, but once reached the outskirts of Birmingham, traffic was there, not so crowded, comparatively, the average speed seems to be low in Birmingham, reached airport 13Min’s before my flight schedule, car parking in Birmingham was the best (just 1min walk), I parked in C12 slot (which later realized is the nearest place to reach airport security), a 30sec run, I’m in airport, a minute to find the security location and if my flight was still there, around 10 Min’s left at in front of security, Luckily, I’m the lone one at security counter (small airports are handy ah ) 6minutes left,1 minute run to boarding area, “well, you are too close sir” was the greeting I got! Sounded like honey to ears, ” I made it”.
Now thinking back, the only thing, I was missing the other day was “Rain”, I love driving in rainy conditions, it would have been awesome had it rained, although I wasn’t sure If I could have make it to my flight
Written by Ravi Nallakukkala on April 13th, 2007 with no comments.
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I come from a strong Eclipse background and in my new assignment, my project team uses IntelliJ IDE; So thought let me check this IntelliJ editor. As expected (after being loyal to Eclipse for many years) first I noticed all the bad things about IntelliJ, Here’s my list of bad things (Let me know if there is a better way of using IntelliJ to get around my problems)
- Once you setup you project on IntelliJ, next time when you open IntelliJ, It takes long time to open the project/ IDE (does some scanning of Java/ jar files) worst part is you can’t even minimize that window/ run the process in back ground.
- Upon installing a plug-in, Eclipse asks for a restart of workbench and upon your approval for restart, eclipse automatically restarts, For the same, Interestingly IntelliJ asks “You need to shut down IDEA to activate changes in plugins. would you like do it now? “; (Notice question doesn’t say ‘Restart’ ); So as expected, you have to (re)start your IDEA explicitly after installing a plugin.
- You Can’t drag and drop a Java file from one folder to another folder.
- IntelliJ expects a developer to configure the classpath twice, once to build the application and the second to run the application compared with eclipse where the same class is used by default.
- With little time i spend on IntelliJ, haven’t found a way to add some pre-configured code templates.
Written by Ravi Nallakukkala on April 11th, 2007 with 2 comments.
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