We Keep Coding

Jade engine in express.js does not warn or throw error for missing commas

I'm using jade as view engine in my node/express app, and it works just fine, even more too fine :) It does not throw error or warning if a comma is missing between tag attributes. For example:
div.main(data-ng-controller="ctrl" data-ng-form="form")
or
script(type="text/javascript" src="script.js" charset="utf-8")
compiles without errors, however the jade syntax docs says to use commas or new lines to separate tag attributes, so these should be the correct lines:
div.main(data-ng-controller="ctrl", data-ng-form="form")
script(type="text/javascript", src="script.js", charset="utf-8")
And the problem is that I use the same jade templates also in a java project, and the java-jade compiler throws bad syntax exception because the missing attribute separators.
In my opinion the node-jade compiler has a bug or something, and the java-jade compiler works in the righ way: as it should. The inconvenience is if I miss a comma during developing my pages in node environment, I won't notice the error until building my java project.
Is it possible to set up the node-jade compiler to throw errors or warnings for missing commas, or am I using it wrong?
The express setup is like this:
app.set('views', 'path/to/views');
app.set('view engine', 'jade');
Thanks guys!

Why I got java.lang.nullpointerexception in elasticsearch build node?

I've test my apps using elasticsearch with very simple line of code. Like this :
Node node = nodeBuilder()
.settings(Settings.settingsBuilder().put("cluster.name", "elasticsearch").put("clster.transport.sniff", true).put("path.home", "/home/kenny/Program/Java/elastic"$
.node();
But I got error like this :
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:113)
at org.elasticsearch.node.internal.InternalSettingsPreparer.randomNodeName(InternalSettingsPreparer.java:198)
at org.elasticsearch.node.internal.InternalSettingsPreparer.finalizeSettings(InternalSettingsPreparer.java:177)
at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:101)
at org.elasticsearch.node.Node.<init>(Node.java:128)
at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:145)
at org.elasticsearch.node.NodeBuilder.node(NodeBuilder.java:152)
at TryElastic.main(TryElastic.java:56)
I don't know how to solve this problem, I've try and looking for the solution. Line 56 at error log, refer to ".node()" method above. So, dou you have suggestion or there are something that I've to add in my code
Thanks.....

The only way this can happen is due to a misconfiguration of path.home.
When Elasticsearch tries to generate a random node name for your instance, it looks for a file at {path.home}/config/names.txt
If the file cannot be found, you'll get a (rather unfriendly and unhelpful) NullPointerException.
So the solution is to check that "/home/kenny/Program/Java/elastic" is really the top-level of an ES installation.
See here for docs on the correct directory layout.

DeepLearning4J NoSuchMethodError

I'm new to neural networks and NLP. I've found this library: DeepLearning4J. I'm trying to get it to work but whenever I execute this instruction:
Collection<String> similar = vec.wordsNearest("word_to_search", 10);
If the word I'm searching is mapped into the network I get the following exception:
java.lang.IllegalArgumentException: XERBLA: Error on argument 6 (LDA) in SGEMV
at org.jblas.NativeBlas.sgemv(Native Method)
at org.nd4j.linalg.jblas.blas.JblasLevel2.sgemv(JblasLevel2.java:25)
at org.nd4j.linalg.api.blas.impl.BaseLevel2.gemv(BaseLevel2.java:53)
at org.nd4j.linalg.api.ndarray.BaseNDArray.mmuli(BaseNDArray.java:2569)
at org.nd4j.linalg.api.ndarray.BaseNDArray.mmul(BaseNDArray.java:2377)
at org.deeplearning4j.models.embeddings.wordvectors.WordVectorsImpl.wordsNearest(WordVectorsImpl.java:290)
at org.deeplearning4j.models.embeddings.wordvectors.WordVectorsImpl.wordsNearest(WordVectorsImpl.java:337)
at word2vec.Word2VecTest.main(Word2VecTest.java:74)
Exception in thread "main" java.lang.NoSuchMethodError: org.nd4j.linalg.api.ndarray.INDArray.mean(I)Lorg/nd4j/linalg/api/ndarray/INDArray;
at org.deeplearning4j.models.embeddings.wordvectors.WordVectorsImpl.wordsNearest(WordVectorsImpl.java:283)
at word2vec.Word2VecTest.main(Word2VecTest.java:89)
I know that the NoSuchMethodError may be due to libraries different versions. In this specific case, this is probably caused by nd4j. I've checked the versions lots of time and this is what I'm importing at the moment:
akka-actor_2.11-2.4-M3.jar
akka-cluster_2.11-2.4-M3.jar
akka-remote_2.11-2.4-M3.jar
akka-slf4j_2.11-2.4-M3.jar
byte-buddy-0.6.15.jar
config-1.3.0.jar
deeplearning4j-core-0.0.3.3.4.alpha2.jar
deeplearning4j-nlp-0.0.3.3.4.alpha2.jar
deeplearning4j-scaleout-akka-0.0.3.3.4.alpha2.jar
deeplearning4j-ui-0.0.3.3.4.alpha2.jar
javassist-3.12.1.GA.jar
jblas-1.2.4.jar
jcublas-6.5.jar
lucene-analyzers-common-4.10.3.jar
lucene-core-4.10.3.jar
nd4j-api-0.4-rc3.4.jar
nd4j-bytebuddy-0.4-rc3.4.jar
nd4j-jblas-0.4-rc3.4.jar
nd4j-jcublas-common-0.4-rc3.4.jar
netty-3.10.4.Final.jar
protobuf-java-2.6.1.jar
reflections-0.9.10.jar
scala-library-2.12.0-M2.jar
selenium-server-standalone-2.47.1.jar
Can someone explain to me the problem?

The error is telling you that DeepLearning4J tried to call the method INDArray INDArray.mean(int value) but this method was not found.
Looking at nd4j 0.4-rc3.4 source code, you can see that the mean method actually takes a vararg int... as input. Since this is not int, the error is thrown.
This change was made by this commit when nd4j bumped version from 0.0.3.5.5.5 to 0.4-rc0.
As a result, you need to downgrade nd4j to version 0.0.3.5.5.5. With this downgrade, you will not have any more incompatibility since this is the actual version that DeepLearning4J is depending on. You can see that in the Maven dependencies of deeplearning4j-core-0.0.3.3.4.alpha2.

java.lang.IllegalArgumentException: no JSON input found while trying google calendar Api in java

I downloaded google calendar api sample from http://code.google.com/p/google-api-java-client/source/browse/calendar-cmdline-sample/?repo=samples and created a project in eclipse.
Now when i try to run the project am getting java.lang.IllegalArgumentException: no JSON input found at this line
FileCredentialStore credentialStore = new FileCredentialStore(
new File(System.getProperty("user.home"), ".credentials/calendar.json"), JSON_FACTORY);
Have any of you tried this example? what is wrong here?

This error can be resolved by providing input to the .credentials/calendar.json file. If you manually provided the following entry in the calendar.json , it will work :
{
"installed": {
"client_id": "client_id",
"client_secret": "client_secret"
}
}
It seems to be the Windows problem which is not allowing to set writable permissions on calendar.json file . The method setWritable(boolean,boolean) is returning false and so is the cause of this problem. Still providing json input manually is not a perfect solutions but your application will work.

That may happen when your application executed before and it created empty .credentials/calendar.json file in you home dir. That may happen if you're running your application in Windows, cause FileCredentialStore tries to do:
file.setReadable(false, false)
and fails.
To solve it just remove calendar.json. Although you might have another error: [unable to set file permissions]
which I don't know how to solve yet.

Is that project having calendar.json resource file. Please share complete exception stack trace.
Seems some required configuration missed from calendar.json file

Java Play Mustache NPE Error

We are getting a mustache play error in production (amazon linux EC2 AMI) but not in development (MACs) and we have tried upgrading the jvm, using the jdk instead, and changing from a tomcat deploy model to match our development environments as much as possible but nothing is working. Please any help would be greatly appreciated. We have lots of shared code in java and javascript using mustache and it would be a big deal to rewrite everything if we had to ditch mustache on the java side.
20:48:52,403 ERROR ~
#6al2dd0po
Internal Server Error (500) for request GET /mystuff/people
Execution exception (In {module:mustache-0.2}/app/play/modules/mustache/MustacheTags.java around line 32)
NullPointerException occured : null
play.exceptions.JavaExecutionException
at play.templates.BaseTemplate.throwException(BaseTemplate.java:90)
at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:257)
at play.templates.Template.render(Template.java:26)
at play.templates.GroovyTemplate.render(GroovyTemplate.java:187)
at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:24)
at play.mvc.Controller.renderTemplate(Controller.java:660)
at play.mvc.Controller.renderTemplate(Controller.java:640)
at play.mvc.Controller.render(Controller.java:695)
at controllers.MyStuff.people(MyStuff.java:183)
at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:548)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:502)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:478)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:473)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:161)
at Invocation.HTTP Request(Play!)
Caused by: java.lang.NullPointerException
at play.modules.mustache.MustacheTags._template(MustacheTags.java:32)
at play.modules.mustache.MustacheTags$_template.call(Unknown Source)
at /app/views/User/people.html.(line:22)
at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:232)
... 13 more

Seems the issue is with the threadlocal. In Prod as per my logs, the session gets initialized with the main thread.
[2012-06-30 18:35:38,102] INFO 10097[**main**] - Mustache module initialized
However, MustacheTag tries to access with various thread like this during request.
[2012-06-30 17:48:44,669] INFO 66048[**play-thread-1**] - [{module:mustache-0.2}/app/play/modules/mustache/MustacheTags.java:46] _meta() :: MustachePlugin.session():null
So I changed the implementation of MustachePlugin like this.Changed line commented out:
//private static ThreadLocal<MustacheSession> session_ = new ThreadLocal<MustacheSession>();
private static MustacheSession _session = null;
public static MustacheSession session(){
//return session_.get();
return _session;
}
public void onConfigurationRead(){
// some code
_session = new MustacheSession(compiler, root);
// some code
}
And it is working fine now in prod mode! I see no reason why it should have been in a ThreadLocal in the first place as the session gets initialized at startup!

your issue is difficult to reproduce so i'll give few pointers here. you have tried to eliminate of issue being env issue. so other possible issues could be
data issue: many times reason for production issue is usually difference in actual data and test data. check if its data issue which is casuing NPE.
code issue: Is there something at people.html.(line:22) causing issue. first try removing / altering that to check if thats causing issue. Or can you get source code of mustache (exact version which you are using) and see what object its trying to create and where its failing.
Properties file for different environments: do you have different proprties file for each env? If yes, have u missed on any property for prod env?

You have a NullPointerException on MustacheTags.java at line 32.
This means that you are probably calling a method of the Mustache library and passing a null value.
Try logging all the parameters you transfer to this method (MyStuff.java line 183?).
You can look at the source code of MustacheTags here, it might help you understand what values you are passing and what should be passed.