Develop Reference

Javauto Compile fails (Getting started)

Following Getting started -
(Windows 7, console: C:...>, .jar & .javauto in the same folder)
java -jar javauto.jar => OK, help is displayed
javauto hello.javauto => command not recognised
javauto.jar hello.javauto => NO result
So i tried this
java -jar javauto.jar -v hello.javauto
Giving this exception (NB: c:...>javac => help display is OK)
Generating ←[92mhello←[0m...
Getting user imports... None
Getting user global variables... None
Getting user functions... None
Generating functions... ←[93mmouseMove ←[0m←[93mmsgBox ←[0m←[93mprint ←[0m←[93msleep ←[0m
Generating class variables... ←[93msimulatedMotionSpeed ←[0m
Generating imports... ←[93mAWTException ←[0m←[93mMouseInfo ←[0m←[93mRobot ←[0m←[93mJDialog ←[0m←[93
mJOptionPane ←[0m
Generating struct objects... None
Generation complete... starting build
Executing cmd /c attrib +s +h "C:\Users\Francis\Develop\java\Javauto\.hello"...
Building ←[92mC:\Users\Francis\Develop\java\Javauto\.hello\class\hello.class←[0m...
Exception in thread "main" java.lang.NullPointerException: Couldn't find java system compiler.
at com.automation.javauto.compiler.CustomJavaCompiler.compile(CustomJavaCompiler.java:36)
at com.automation.javauto.parser.Create.main(Create.java:419)

Try this:
1) Compile it using this command:
java -jar javauto.jar hello.javauto
2) Now that you have compiled your program, there will be a file called hello.jar. Execute with:
java -jar hello.jar

Unable to load library 'cxcore': libcxcore.so: cannot open shared object file: No such file or directory

When I run project jar file, it gives following error message
Exception in cameracheck Thread - check();java.util.concurrent.ExecutionException: java.lang.UnsatisfiedLinkError: Unable to load library 'cxcore': libcxcore.so: cannot open shared object file: No such file or directory
Exception in thread "main" java.lang.NullPointerException
at CameraProperties.CheckForCameraPlugin.check(CheckForCameraPlugin.java:55)
at Main.Main.main(Main.java:49)
Thanks Haris. You spend much time with me. Thanks a lot. The issue has
been sorted out. I provided 2 commands inside /usr/local/lib. 1) sudo
ln -s libopencv_core.so.2.4.6 libcxcore.so 2) sudo ln -s
libopencv_highgui.so.2.4.6 libhighgui.so. In another computer with
2.3.1 version of opencv, I provided the same commands with corresponding version number under /usr/lib. Thanks again. I am so
happy. :) :) :)

ProcessBuilder can't find perl

I'm trying to execute a perl script from java with the following code:
ProcessBuilder script =
new ProcessBuilder("/opt/alert-ssdb.pl");
Process tmp = script.start();
But when I execute it it returns
java.io.IOException: Cannot run program "/opt/alert-ssdb.pl": java.io.IOException: error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:488)
at scripttest.main(scripttest.java:11)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
at java.lang.ProcessImpl.start(ProcessImpl.java:81)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:470)
... 1 more
about the file
ls -l alert-ssdb.pl
-rwxr-xr-x. 1 root root alert-ssdb.pl
I tried running /usr/bin/perl/ with the script as an argument and it also failed with the same exception.
/bin/ls and other simple commands run without a problem though.
Also the first line of the script is #!/usr/bin/perl
and when run on command line it works
what am I missing?
//Update:
The big picture is that I'm trying to call the script via a storm bolt and it fails at that point.
I managed to make it work by defining a python script as a bolt
using
super(python,myscript.py)
(myscript imports the storm library) and from myscript I call the perl script.
I haven't tried yet but I suppose that If I modify the perl script to be a storm bolt it will run nicely.

Try changing
new ProcessBuilder("/opt/alert-ssdb.pl");
to:
new ProcessBuilder("/usr/bin/perl", "/opt/alert-ssdb.pl");
I've had past experiences where not all my environment variables from the shell exist when using ProcessBuilder.
Edited to reflect #dcsohl's comment.

tdbloader on Cygwin: Gettging FileNotFoundException: d:\cygdrive\d\....\node2id.idn

I am completely new to Jena/TDB. All I want to do is to load data from some sample rdf, N3 etc file using tdb scripts or through java api.
I am tried to use tbdloader on Cygwin to load data (tdb-0.9.0, on Windows XP with IBM Java 1.6). Following are the command that I ran:
$ export TDBROOT=/cygdrive/d/Project/Store_DB/jena-tdb-0.9.0-incubating
$ export PATH=$TDBROOT/bin:$PATH
I also changed classpath for java in the tdbloader script as mentioned at tdbloader on Cygwin: java.lang.NoClassDefFoundError :
exec java $JVM_ARGS $SOCKS -cp "PATH_OF_JAR_FILES" "tdb.$TDB_CMD" $TDB_SPEC "$#"
So when I run $ tdbloader --help it shows the help correctly.
But when I run
$ tdbloader --loc /cygdrive/d/Project/Store_DB/data1
OR
$ tdbloader --loc /cygdrive/d/Project/Store_DB/data1 test.rdf
I am getting following exception:
com.hp.hpl.jena.tdb.base.file.FileException: Failed to open: d:\cygdrive\d\Project\Store_DB\data1\node2id.idn (mode=rw)
at com.hp.hpl.jena.tdb.base.file.ChannelManager.open$(ChannelManager.java:83)
at com.hp.hpl.jena.tdb.base.file.ChannelManager.openref$(ChannelManager.java:58)
at com.hp.hpl.jena.tdb.base.file.ChannelManager.acquire(ChannelManager.java:47)
at com.hp.hpl.jena.tdb.base.file.FileBase.<init>(FileBase.java:57)
at com.hp.hpl.jena.tdb.base.file.FileBase.<init>(FileBase.java:46)
at com.hp.hpl.jena.tdb.base.file.FileBase.create(FileBase.java:41)
at com.hp.hpl.jena.tdb.base.file.BlockAccessBase.<init>(BlockAccessBase.java:46)
at com.hp.hpl.jena.tdb.base.block.BlockMgrFactory.createStdFile(BlockMgrFactory.java:98)
at com.hp.hpl.jena.tdb.base.block.BlockMgrFactory.createFile(BlockMgrFactory.java:82)
at com.hp.hpl.jena.tdb.base.block.BlockMgrFactory.create(BlockMgrFactory.java:58)
at com.hp.hpl.jena.tdb.setup.Builder$BlockMgrBuilderStd.buildBlockMgr(Builder.java:196)
at com.hp.hpl.jena.tdb.setup.Builder$RangeIndexBuilderStd.createBPTree(Builder.java:165)
at com.hp.hpl.jena.tdb.setup.Builder$RangeIndexBuilderStd.buildRangeIndex(Builder.java:134)
at com.hp.hpl.jena.tdb.setup.Builder$IndexBuilderStd.buildIndex(Builder.java:112)
at com.hp.hpl.jena.tdb.setup.Builder$NodeTableBuilderStd.buildNodeTable(Builder.java:85)
at com.hp.hpl.jena.tdb.setup.DatasetBuilderStd$NodeTableBuilderRecorder.buildNodeTable(DatasetBuilderStd.java:389)
at com.hp.hpl.jena.tdb.setup.DatasetBuilderStd.makeNodeTable(DatasetBuilderStd.java:300)
at com.hp.hpl.jena.tdb.setup.DatasetBuilderStd._build(DatasetBuilderStd.java:167)
at com.hp.hpl.jena.tdb.setup.DatasetBuilderStd.build(DatasetBuilderStd.java:157)
at com.hp.hpl.jena.tdb.setup.DatasetBuilderStd.build(DatasetBuilderStd.java:70)
at com.hp.hpl.jena.tdb.StoreConnection.make(StoreConnection.java:132)
at com.hp.hpl.jena.tdb.transaction.DatasetGraphTransaction.<init>(DatasetGraphTransaction.java:46)
at com.hp.hpl.jena.tdb.sys.TDBMakerTxn._create(TDBMakerTxn.java:50)
at com.hp.hpl.jena.tdb.sys.TDBMakerTxn.createDatasetGraph(TDBMakerTxn.java:38)
at com.hp.hpl.jena.tdb.TDBFactory._createDatasetGraph(TDBFactory.java:166)
at com.hp.hpl.jena.tdb.TDBFactory.createDatasetGraph(TDBFactory.java:74)
at com.hp.hpl.jena.tdb.TDBFactory.createDataset(TDBFactory.java:53)
at tdb.cmdline.ModTDBDataset.createDataset(ModTDBDataset.java:95)
at arq.cmdline.ModDataset.getDataset(ModDataset.java:34)
at tdb.cmdline.CmdTDB.getDataset(CmdTDB.java:137)
at tdb.cmdline.CmdTDB.getDatasetGraph(CmdTDB.java:126)
at tdb.cmdline.CmdTDB.getDatasetGraphTDB(CmdTDB.java:131)
at tdb.tdbloader.loadQuads(tdbloader.java:163)
at tdb.tdbloader.exec(tdbloader.java:122)
at arq.cmdline.CmdMain.mainMethod(CmdMain.java:97)
at arq.cmdline.CmdMain.mainRun(CmdMain.java:59)
at arq.cmdline.CmdMain.mainRun(CmdMain.java:46)
at tdb.tdbloader.main(tdbloader.java:53)
Caused by: java.io.FileNotFoundException: d:\cygdrive\d\Project\Store_DB\data1\node2id.idn (The system cannot find the path specified.)
at java.io.RandomAccessFile.open(Native Method)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:222)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:107)
at com.hp.hpl.jena.tdb.base.file.ChannelManager.open$(ChannelManager.java:80)
... 37 more
I am not sure what node2id.idn file is and why is it expecting it?

The file node2id.idn is one of TDB's internal index files. It's not something that you have to create or manage for yourself. I've just tried tdbloader on cygwin myself, it it worked OK for me. I can think of two basic possibilities:
your disk is full
the TDB index is corrupted
If this is the first file you are loading into an otherwise emtpy TDB, the second possibility is unlikely. If you are loading into a non-empty TDB, try deleting the TDB image and starting again. Note that TDB by itself does not manage concurrent writes: if you have more than one process writing to a single TDB image, you must handle locking at the application level, or use TDB's transactions.
The final possibility, of course, is that your disk is flaky. You might want to try your code on another machine.
If none of these suggestions help, please send a complete minimal test case to the Jena users list.

Problem using JNI - Error when generating header file

I used the following guide to get started, http://cnd.netbeans.org/docs/jni/beginning-jni-win.html.
But when I try to generate the header file using the command below
JAVA_HOME\bin\javah.exe -o
HelloWorldNative.h -jni
-classpath PROJECTS_ROOT\HelloWorld\build\classes
helloworld.Main
I get the following error.
Error: Can't recover from an I/O
error with the following message:
HelloWorldNative.h (access denied)
Thanks in advance :)

Looks to me like you are standing in a directory where you are not granted write access when you run javah.
Edit: What if you specify a full path to somewhere you know you have write access?

I also got that problem and this is how I solved it:
After building your project,go to the directory where your .class files are.
e.g C:\Users\Development\Documents\NetBeansProjects\DLLDevelopment\build\classes
and run your command again.