testzone

FFMpeg extract images

2011-08-29T08:15:00.000-07:00

To get a decent quality of extracted images, use the -sameq flag as such:

ffmpeg -i falename.avi -r 20 -ss 00:00:21 -t 8 -sameq image_doler/image%03d.png

OpenGL MacOS 64bit

2011-08-16T04:20:00.001-07:00

Had problems mostly due to being unfamiliar with Mac development.

Good example (which compiles if given x86_64 architecture) trough XCode is here. Also, useful information is here and general reading here.

OpenCV 2.3.0 on OSX (10.6.8 64bit)

2011-08-11T14:01:00.000-07:00

The notes from here are generally correct. My additions are:

use Fink to get additional libraries if needed
OpenEXR library is cool, but it's not necessary. I had to disable it because of some typedef redeclaration which conflicted with QT.framework (QT = quicktime)
QTKit comes with XCode and should not be downloaded separately
JPEG2000 support is called libjasper. Also had to disable it because Fink was compiling 386 version instead of 64bit one
don't use Carbon, it's outdated when Cocoa is around. It's needed for highgui
when running configuration initially run ccmake to setup the prefix to "/sw". Didn't find the cli parameter for it.
also did this at some point

sudo fink install pkgconfig libjpeg libtiff libpng3 atk1 gtk+2-dev glib2-dev

No idea if it was actually needed, but it was in some net post.

Final make command is:

cmake -G "Unix Makefiles" -D BUILD_TESTS=OFF -D WITH_CARBON=OFF -D WITH_OPENEXR=OFF -D WITH_JASPER=OFF .
make -j4
sudo make install

Unlike linux version, this OpenCV is linked by doing -lopencv_core -lopencv_*. Don't know if that came with the new version, but it's going to mess with my server builds.

Instant http server

2007-01-08T14:08:00.000-08:00

It only needs one line in Linux bash

python -c 'import SimpleHTTPServer; SimpleHTTPServer.test()'

Tested working for python2.4

EntityManager.remove() not working

2006-12-16T08:36:00.000-08:00

One of the possible reasons for this is that you (like me) assigned a Local interface instance to a remote interface. No error, no exceptions - just your application not working... Very nice for loosing your nerves...

Hibernate confusion

2006-12-14T02:05:00.000-08:00

or "How stuff doesn't work the way the API says it should"

Two irregularities so far:
1) EntityManager.persist() should Make an entity instance managed and persistent, but all it does is throw an exception about non-persistent object passed (or something alike)

2) EntityManager.remove() should throw IllegalArgumentException - if not an entity or if a detached entity but all it does in JBoss is issue

INFO  [DefaultDeleteEventListener] handling transient entity in delete processing

The first is probably me not understanding something, but the second is just strange...

Reference API site

Value '0000-00-00' can not be represented as java.sql.Timestamp

2006-12-13T13:06:00.000-08:00

This is a MySQL specific error.

As said on lo-fi, this is a problem that happens when there's a row in the table with all zero date.

Answer:
zeroDateTimeBehavior=convertToNull tag at the end of the connection string, e.g.

jdbc:mysql://myhost/mydatabase?zeroDateTimeBehavior=convertToNull

Jboss default JSF problem

2006-09-21T05:38:00.000-07:00

From the forums

Quote from bfo81:

Another reason why you may be getting this error in JBoss is if you are using another JSF implementation besides MyFaces.

http://docs.jboss.org/jbossas/jboss4guide/r4/html/ch9.chapt.html

"To use another JSF implementation, such as the reference implementation, instead of the bundled MyFaces implementation, simply delete the jbossweb-tomcat55.sar/jsf-lib directory. You will need to include the the implementation JAR files in your own WEB-INF/lib directory for each web application making use of JSF."

JSF commandLink param combination

2006-09-12T14:36:00.000-07:00

The "big secret":

jsf part:


<h:commandlink value="a" actionlistener="#{tableData.deletePerson}" 
action="#{tableData.getOutcome}">
     <f:param name="id" value="1">
</h:commandLink>

bean part:


public void deletePerson(ActionEvent event){
    int id = Integer.parseInt((String)FacesContext.getCurrentInstance()
        .getExternalContext().getRequestParameterMap().get("id"));
    bunch.remove(id);
}

Lucene use-tree

2006-08-24T05:54:00.000-07:00

Principles of Lucene use:
iw = IndexWriter(root_dir, Analizer_object, whether_to_create_or_not)
CreateDocument{
doc = new Document();
field = new Field(name, content, to_store_or_not, to_index_or_not);
content can be String or Reader
doc.add(filed)
}
iw.addDocument(doc)
ir = IndexReader(root_dir)
searcher = new IndexSearcher(ir)
analyzer = new StandardAnalyzer()
parser = new QueryParser(defalt_field, analyzer)
Query query = parser.parse(line)
Hits hits = searcher.search(query);
hits.length()
hits.id(i)
hits.score(i)
Document doc = hits.doc(i);

For more information refer to the GettingStarted tutorial which comes with Lucene

2 monitors hooked on Slack-box

2006-08-24T01:55:00.000-07:00

All that it took was little meddling with /etc/X11/xorg.conf. Winning combination is:

Section "Device"
  VideoRam    131072
  Identifier     "gf5200"
  Driver    "nvidia"
  VendorName     "nVidia Corporation"
  BoardName    "NV34 [GeForce FX 5200]"
  BusID    "PCI:02:00:0"
  # TwinView stuff
  Option "TwinView" "true"
  Option "ConnectedMonitor" "CRT, CRT"
  Option "TwinViewOrientation" "RightOf"
  Option "MetaModes" "1024x768,800x600"
  Option "HorizSync"  "30.0-64.0"
  Option "VertRefresh"  "50.0-110.0"
EndSection

Good tut
Nvidia read-me

An in-code solution for JNDI.properties

2006-08-07T06:03:00.000-07:00

Found it here Still need to check if it really works...

Properties jndiProps = new Properties(); jndiProps.setProperty(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory"); jndiProps.setProperty(Context.URL_PKG_PREFIXES,
"org.jboss.naming:org.jnp.interface");
jndiProps.setProperty(Context.PROVIDER_URL, "jnp://192.168.9.6:1099");
InitialContext ctx = new InitialContext(jndiProps );

Oracle Jboss batch support

2006-08-01T07:03:00.000-07:00

The client error message is:
...localId=18] status=STATUS_NO_TRANSACTION; - nested throwable: (javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update)

I found that the " JDBC batch updates for versioned data" can be enabled by adding in persistence.xml the following line:
<property name="hibernate.jdbc.batch_versioned_data">true</property>

But it doesn't eliminate the error...
My forum thread on JBoss forums is here

Epilog
After re-doing the entire thing from scratch, it worked like a charm. No clue what went wrong the first time, but I must've forgot some little thing like registring a -ds.xml for Oracle or something like that...

Oracle + JBoss

2006-07-28T08:22:00.000-07:00

Driver classes12.jar can be found in instantclient-basic-win32-10.2.0.2-20060508.zip from oracle.com
can be put in server/<all>/lib.

Example -ds.xml files can be found at <JBOSS_HOME>\docs\examples\jca\oracle-ds.xml

Dialect must be specified in persistence.xml (for Oracle 10g is org.hibernate.dialect.Oracle9Dialect , or at least it worked...)

Entity mapping and the rest are as normal.

JBoss port 1098 conflict

2006-07-28T05:16:00.000-07:00

From here

For installing JBoss I also just unpacked JBoss zip-archive into "c:/java/jboss-4.0.3SP1". In my configuration JBoss conflict by port 1098, so I changed port of the RMI naming service from 1098 to 1096 in "c:/java/jboss-4.0.3SP1/server/default/conf/jboss-service.xml"

note: this doesn't effect the basic tests just fmi (for my information :P )

Client/server library version error

2006-07-23T09:36:00.000-07:00

http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3915055

advice/Interceptor error

2006-07-23T09:35:00.000-07:00

Exception in thread "main" java.lang.NoClassDefFoundError: [Lorg/jboss/aop/advice/Interceptor;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2232)

Answers:

http://www.velocityreviews.com/forums/t297895-ejb3-and-jboss-404-ga.html
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=67923

log4j.xml

2006-07-23T09:32:00.000-07:00

log4j.xml should be in "beans_name".jar/META-INF not in .ear file (standard log4j.xml from
tests should work). In jDev you can do this by placing it in <APP_NAME>/Application Sources/
there it should detect the META-INF folder that you specify. In the source tree it should be
in <PROJ_NAME>/<APP_NAME>/src/"PLACE META-INF HERE"

Library combination for jDev + JBoss

2006-07-23T09:29:00.000-07:00

- <JBOSS_HOME>/lib/*.jar
- <JBOSS_HOME>/lib/endorsed/*.jar
- <JBOSS_HOME>/server/all/lib/*.jar
- <my_added_libs_directory>/jboss-annotations-ejb3.jar
- <my_added_libs_directory>/jboss-ejb3.jar
- <my_added_libs_directory>/jboss-ejb3x.jar
And for client:
- <JBOSS_HOME>\server\all\deploy\jboss-aop-jdk50.deployer\jboss-aop-jdk50.jar
- <JBOSS_HOME>\server\all\lib\javax.servlet.jar
- <JBOSS_HOME>\server\all\deploy\jboss-aop-jdk50.deployer\jboss-aspect-library-jdk50.jar

This eliminates the library version errors nad naming context error.

jDevelope client execution dir + jndi.properties

2006-07-23T02:31:00.000-07:00

Unless specified diffrently is in:

/<WorkSpaceName>/<ApplicationName>/classes
(this is where jndi.properties should go)

Usual jndi.properties content:

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost

jDevelope JBoss test client dependencies

2006-07-23T02:29:00.000-07:00

http://www.velocityreviews.com/forums/t297895-ejb3-and-jboss-404-ga.html
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=67923

Valuable notes:

Yes, one needs javax.servlet.jar now, too. Actually the subject should be named "Needs a client to be a server?" At the moment my rich client application requires:

./server/all/deploy/jboss-hibernate.deployer/ejb3-persistence.jar
./server/all/deploy/jboss-aop-jdk50.deployer/jboss-aop-jdk50.jar
./server/all/deploy/jboss-aop-jdk50.deployer/jboss-aspect-library-jdk50.jar
./server/all/deploy/ejb3.deployer/jboss-ejb3.jar
./server/all/deploy/ejb3.deployer/jboss-ejb3x.jar
./server/all/lib/jboss-remoting.jar
./server/all/lib/jboss-j2ee.jar
./server/all/lib/javax.servlet.jar
./client/jboss-client.jar
./client/jboss-common-client.jar
./client/jboss-transaction-client.jar
./client/jbossmq-client.jar
./client/jbosssx-client.jar
./client/jmx-invoker-adaptor-client.jar
./client/jnp-client.jar
./lib/concurrent.jar
./server/all/deploy/jboss-hibernate.deployer/hibernate3.jar
./server/all/deploy/jboss-hibernate.deployer/asm-attrs.jar
./server/all/deploy/jboss-hibernate.deployer/asm.jar
./server/all/deploy/jboss-hibernate.deployer/cglib-2.1.1.jar

JBoss debugging

2006-07-22T07:25:00.000-07:00

from /bin/run.bat: [correctly set, if you say suspend=y, the server blocks]

rem JPDA options. Uncomment and modify as appropriate to enable remote debugging.
set JAVA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n %JAVA_OPTS%

[TODO: find JPDA settings for JDev]
Usefull
NamingContext problem for OC4J solution

JBoss 4.0.4 EJB 3.0 add-on missing files

2006-07-19T06:05:00.000-07:00

Usefull forum thread here

jboss-annotations-ejb3.jar is located in jboss-EJB-3.0_RC8-FD\lib\ejb3.deployer\ in the jboss-EJB-3.0_RC8-FD package.

boss-ejb3-client.jar and hibernate-client.jar can be found here

JSF recursion problem

2006-07-17T12:28:00.000-07:00

index.jsp

<jsp:forward page="shouts/test.jsp" />

test.jsp - normal jsf.

web.xml snippet:
-----------------
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>/shouts/*</url-pattern>
</servlet-mapping>

Java EE

2006-07-16T04:10:00.000-07:00

javax.persistance and the rest of the EE components can be found in AppServer/lib/javaee.jar

Sun AS 9 - MySQL connection

2006-07-16T02:40:00.000-07:00

Usefull link

Basic:
1) download mysql-connector-java-3.1.13.tar.gz from here
2) extract mysql-connector-java-3.1.13-bin.jar && copy to AppServer/lib
ping from asadmin/webgui should work

EDIT:
even with this the server reported "Database not found" or similar error, so the problem remains, will try after I finish with jBoss