Develop Reference

Issue in addPlugInSingleRowFunction upgrading Esper version from 5.3 to 8.3

In our existing application we are using Esper Version 5.3.
We have added few addPlugInSingleRowFunction() to use it in EPL as below --
final Configuration cepConfiguration = new Configuration();
cepConfiguration.addPlugInSingleRowFunction("toNumber", Double.class.getName(), "parseDouble");
cepConfiguration.addPlugInSingleRowFunction("toBoolean", Boolean.class.getName(), "parseBoolean");
This was working fine in 5.3 version.
Post upgrading to 8.3 above code changed as per Esper documentation --
cepConfiguration.getCompiler().addPlugInSingleRowFunction("toNumber", Double.class.getName(), "parseDouble");
cepConfiguration.getCompiler().addPlugInSingleRowFunction("toBoolean", Boolean.class.getName(), "parseBoolean");
But once the sendEventBean() method is called to send a Event to runtime we are seeing below exception every time.
Surprisingly events are getting matched as per the statements present in runtime even if below exception are coming. Though we are not sure whether some events are not matching or not.
Can someone please help on this?
applog.cls=com.espertech.esper.common.internal.epl.expression.dot.core.ExprDotNodeForgeStaticMethodEval,applog.mthd=staticMethodEvalHandleInvocationException,applog.line=228,applog.msg=Invocation exception when invoking method 'parseDouble' of class 'java.lang.Double' passing parameters [null] for statement 'stmt-0': NullPointerException : null,exc.stack=java.lang.NullPointerException\n\tat sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838)\n\tat sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)\n\tat java.lang.Double.parseDouble(Double.java:538)\n\tat generated.StatementAIFactoryProvider_a4bd241445010f45474e4598e34521ca1b2836db_stmt450.m8(StatementAIFactoryProvider_a4bd241445010f45474e4598e34521ca1b2836db_stmt450.java:161)\n\tat generated.StatementAIFactoryProvider_a4bd241445010f45474e4598e34521ca1b2836db_stmt450$2.get(ANONYMOUS.java:148)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.FilterParamIndexEquals.matchEvent(FilterParamIndexEquals.java:32)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.FilterHandleSetNode.matchEvent(FilterHandleSetNode.java:100)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.EventTypeIndex.matchType(EventTypeIndex.java:178)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.EventTypeIndex.matchEvent(EventTypeIndex.java:124)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.FilterServiceBase.retryableMatchEvent(FilterServiceBase.java:179)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.FilterServiceBase.evaluateInternal(FilterServiceBase.java:96)\n\tat com.espertech.esper.runtime.internal.filtersvcimpl.FilterServiceLockCoarse.evaluate(FilterServiceLockCoarse.java:52)\n\tat com.espertech.esper.runtime.internal.kernel.service.EPEventServiceImpl.processMatches(EPEventServiceImpl.java:610)\n\tat com.espertech.esper.runtime.internal.kernel.service.EPEventServiceImpl.processWrappedEvent(EPEventServiceImpl.java:450)\n\tat com.espertech.esper.runtime.internal.kernel.thread.InboundUnitSendEvent.run(InboundUnitSendEvent.java:43)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\n\tat java.lang.Thread.run(Thread.java:748)

You could turn on compiler logging (config.getCompiler().getLogging().setEnableCode(true);) and make sure you have INFO level logging. You can inspect "StatementAIFactoryProvider_a4bd241445010f45474e4598e34521ca1b2836db_stmt450.m8" at line 161 to see what the problem is. Sounds like a null value gets passed to Double.parseDouble. But since I don't have the complete code its hard to say.

Error in ColdFusion Javacast array to class from loadPaths

I am trying to use Elasticsearch's Java API.
I am trying to create a RestClientBuilder.
Host=createObject("java", "org.apache.http.HttpHost").init(variables.HostName, variables.Port);
Node=createObject("java", "org.elasticsearch.client.Node").init(Host);
RestClient=createObject("java", "org.elasticsearch.client.RestClient").builder(Javacast("org.elasticsearch.client.Node[]", [Node])).build();
I get the error
Cannot convert the value to Java array because type org.elasticsearch.client.Node is unknown.
Also if I just try to use:
RestClient=createObject("java", "org.elasticsearch.client.RestClient").builder(Javacast("org.apache.http.HttpHost[]", [Host]));
I get the following error
Either there are no methods with the specified method name and
argument types or the builder method is overloaded with argument types
that ColdFusion cannot decipher reliably. ColdFusion found 0 methods
that match the provided arguments. If this is a Java object and you
verified that the method exists, use the javacast function to reduce
ambiguity.
This I assume is because ColdFusion doesn't play nicely with varargs

I found a workaround using this method
https://www.bennadel.com/blog/1980-tojava---a-coldfusion-user-defined-function-for-complex-java-casting.htm
I believe there is a bug with Javacast and javaSettings loadPaths not being used.
coldfusion.runtime.Cast$UnknownTypeException: Cannot convert the value
to Java array because type org.elasticsearch.client.Node is unknown.
at coldfusion.runtime.Cast.toJavaArray(Cast.java:1602)
Additionally if I try to perform the actiuons that the UDF takes
local.javaClass = createObject("java", "org.apache.http.HttpHost");
local.HostArrayReflect = createObject("java", "java.lang.reflect.Array");
local.HostArray = local.HostArrayReflect.newInstance(
local.javaClass.GetClass()
, JavaCast( "int", ArrayLen(local.Hosts))
);
for (i=0; i LT ArrayLen(local.Hosts); i=i+1) {
local.HostArrayReflect.Set(local.HostArray, JavaCast("int", i), local.Hosts[i]);
}
I get the error
An exception occurred while instantiating a Java object. The class
must not be an interface or an abstract class. If the class has a
constructor that accepts an argument, you must call the constructor
explicitly using the init(args) method. Error :
org.apache.http.HttpHost
java.lang.NoSuchMethodException: org.apache.http.HttpHost.() at
java.lang.Class.getConstructor0(Class.java:3082) at
java.lang.Class.newInstance(Class.java:412) at
coldfusion.runtime.java.JavaProxy.createObjectWithDefaultConstructor(JavaProxy.java:209)
at coldfusion.runtime.java.JavaProxy.invoke(JavaProxy.java:92)
This happens when I try to run getClass(), but in the UDF there is no issue. A coworker tried to run this on Lucee and it seems to have worked, so I believe there is a bug in CF related to this.

Error in generating Java Wrapper in Web3j

I am trying to generate java Wrapper for a smart contract, but it failed because of this error:
Exception in thread "main" java.lang.IllegalArgumentException: not a valid name: Main.sol:main
at com.squareup.javapoet.Util.checkArgument(Util.java:64)
at com.squareup.javapoet.TypeSpec$Builder.<init>(TypeSpec.java:383)
at com.squareup.javapoet.TypeSpec$Builder.<init>(TypeSpec.java:362)
at com.squareup.javapoet.TypeSpec.classBuilder(TypeSpec.java:90)
at org.web3j.codegen.SolidityFunctionWrapper.createClassBuilder(SolidityFunctionWrapper.java:172)
at org.web3j.codegen.SolidityFunctionWrapper.generateJavaFiles(SolidityFunctionWrapper.java:103)
at org.web3j.codegen.SolidityFunctionWrapper.generateJavaFiles(SolidityFunctionWrapper.java:91)
at org.web3j.codegen.SolidityFunctionWrapperGenerator.generate(SolidityFunctionWrapperGenerator.java:123)
at org.web3j.codegen.SolidityFunctionWrapperGenerator.main(SolidityFunctionWrapperGenerator.java:87)
at org.web3j.codegen.SolidityFunctionWrapperGenerator.run(SolidityFunctionWrapperGenerator.java:48)
at org.web3j.console.Runner.main(Runner.java:38)
I followed what this guy said to remove this error
https://github.com/web3j/web3j/issues/16]
and give a default name (letters alphabetically) for each empty property as the following:
[{"constant":true,"inputs":
[{"name”:”a”,”type":"bytes32"}],"name":"ApprovedTAs","outputs":
[{"name":"Trade_id","type":"bytes32"},{"name":"Trade_producer","type":"address"},{"name":"Trade_consumer","type":"address"},{"name":"Trade_rate","type":"uint256"},{"name":"Trade_from","type":"uint256"},{"name":"Trade_to","type":"uint256"},{"name":"Trade_broker","type":"address"},{"name":"Trade_topic","type":"uint256"},{"name":"approvedByA","type":"bool"},{"name":"approvedByB","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name”:”b”,”type":"address"},{"name”:”c”,”type":"uint256"}],"name":"offersByProducer","outputs":[{"name":"offer_id","type":"uint256"},{"name":"offer_producer","type":"address"},{"name":"offer_topic","type":"uint256"},{"name":"offer_rate","type":"uint256"},{"name":"offer_from","type":"uint256"},{"name":"offer_to","type":"uint256"},{"name":"offer_broker","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getAll","outputs":[{"name”:”d”,”type":"address[]"},{"name”:”e”,”type":"address[]"},{"name”:”f”,”type":"address[]"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"mk_producer","type":"address"},{"name":"mk_topic","type":"uint256"},{"name":"mk_rate","type":"uint256"},{"name":"mk_from","type":"uint256"},{"name":"mk_to","type":"uint256"},{"name":"mk_broker","type":"address"}],"name":"mkOrder","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name”:”g”,”type":"uint256"}],"name":"offers","outputs":[{"name":"offer_id","type":"uint256"},{"name":"offer_producer","type":"address"},{"name":"offer_topic","type":"uint256"},{"name":"offer_rate","type":"uint256"},{"name":"offer_from","type":"uint256"},{"name":"offer_to","type":"uint256"},{"name":"offer_broker","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"ofr_topic","type":"uint256"},{"name":"ofr_rate","type":"uint256"},{"name":"ofr_from","type":"uint256"},{"name":"ofr_to","type":"uint256"},{"name":"ofr_broker","type":"address"}],"name":"offer","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name”:”h”,”type":"uint256"},{"name”:”ii”,”type":"uint256"}],"name":"allAdd","outputs":[{"name”:”j”,”type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"sndC_id","type":"bytes32"},{"name":"sndC_producer","type":"address"},{"name":"sndC_broker","type":"address"},{"name":"sndC_topic","type":"uint256"},{"name":"sndC_from","type":"uint256"},{"name":"sndC_to","type":"uint256"},{"name":"sndC_count","type":"uint256"}],"name":"sendCCube","outputs":[{"name”:”l”,”type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"bytes32"}],"name":"agreeTA","outputs":[{"name”:”m”,”type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"sndP_id","type":"bytes32"},{"name":"sndP_broker","type":"address"},{"name":"sndP_topic","type":"uint256"},{"name":"sndP_from","type":"uint256"},{"name":"sndP_to","type":"uint256"},{"name":"sndP_count","type":"uint256"}],"name":"sendPCube","outputs":[{"name”:”n”,”type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name”:”o”,”type":"bytes32"}],"name":"CreatedTAs","outputs":[{"name":"Trade_id","type":"bytes32"},{"name":"Trade_producer","type":"address"},{"name":"Trade_consumer","type":"address"},{"name":"Trade_rate","type":"uint256"},{"name":"Trade_from","type":"uint256"},{"name":"Trade_to","type":"uint256"},{"name":"Trade_broker","type":"address"},{"name":"Trade_topic","type":"uint256"},{"name":"approvedByA","type":"bool"},{"name":"approvedByB","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"nkname","type":"string"},{"name":"code","type":"uint256"}],"name":"register","outputs": [{"name”:”p”,”type":"bool"}],"payable":false,"type":"function"}]
But the error still the same. I also changed the name of the contract rather than "main" but nothing change.
I also changed every variable name has numbers, special characters or even starting with _ but still doesn't work.
Any idea what I should change to solve this error
Thanks

This error is triggered if you are declaring a function o event with only the argument type without a name.for example :
event myevent(string)
should be
event myevent(string message);

Why does Java 8's Nashorn engine in strict mode throw a java.lang.ClassCastException when calling apply() and passing the arguments object directly?

When I call eval (in strict mode) on a nashorn engine with the following script I get an exception:
var yfunc = function () {
(null).apply(null, arguments);
};
yfunc();
I've truncated my personal situation heavily. The "(null)" on line 2 can be replaced with anything between parenthesis or a local variable, either way just something that shouldn't throw a compile error, and it will yield the same result.
The issue seems to be explicitly that "arguments" is passed directly as the second argument of calling a method called "apply". Any of the following changes will undo the thrown exception:
Putting "arguments" in a variable first (but simply wrapping it in parenthesis doesn't work!)
Calling something other than apply
Passing "arguments" in a different argument slot when calling apply
Calling print() (with or without passing any arguments) as a preceding line of code inside yfunc() (weird huh?)
Defining more than 0 parameters for yfunc()
Binding yfunc first and then calling the bound method
Calling yfunc via Function.apply (not so much with Function.call!)
The Exception thrown is this:
Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.runtime.Undefined to jdk.nashorn.internal.runtime.ScriptFunction
at java.lang.invoke.MethodHandleImpl.newClassCastException(MethodHandleImpl.java:361)
at java.lang.invoke.MethodHandleImpl.castReference(MethodHandleImpl.java:356)
at jdk.nashorn.internal.scripts.Script$\^eval\_.:program(<eval>:4)
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:449)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:406)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:402)
at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
When I call this method with an owner, the exception thrown changes. Example code:
var yfunc = {
method: function () {
(null).apply(null, arguments);
}
};
var x = yfunc.method();
Then the thrown exception looks like this:
Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.scripts.JO4 to jdk.nashorn.internal.runtime.ScriptFunction
at java.lang.invoke.MethodHandleImpl.newClassCastException(MethodHandleImpl.java:361)
at java.lang.invoke.MethodHandleImpl.castReference(MethodHandleImpl.java:356)
at jdk.nashorn.internal.scripts.Script$\^eval\_.:program(<eval>:5)
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:449)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:406)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:402)
at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
I've reproduced the issue so far on specifically these environments:
windows 7 64bit -> jdk 1.8.0_60 64bit
windows 8 64bit -> jdk 1.8.0_131 64bit
I can't seem to find anything on the internet about similar issues. Do I need to report this to Oracle/OpenJDK?
Minor update
Added items 6 and 7 to list of "following changes will undo the thrown exception".
Final update
Bug filed: JDK-8184720

Yes, it appears to be a bug. Please file a bug.

Java Exception appends ": null" to "Caused by" clause

There are some exceptions shown as follows in my log: (the text has been modified to conceal project information)
java.util.concurrent.ExecutionException:org.xxx.BBBException<br>
at ....<br>
...<br>
Caused by: org.xxx.BBBException: null<br>
at ....<br>
...<br>
Why is there "null" in the Caused by clause?
BBBException, which was made by us, extends Exception and does not override toString().
In some situations, FutureTask.setException(new BBBException("RPC timed out")) is called and BBBException is being expected in the log.
However, the exception's details message is not what we set in the program and the text in the first line and Caused by clause even do not match (there is no ": null" in the first line).
Anyone has a clue why this has happened? Thanks!
Environment: java 6, update 21, centos 64-bit, java 64-bit, mixed mode.

I suspect you've either actually created a new BBBException without a message, or your BBBException(String) constructor doesn't pass the message up to the super-constructor (which it should, via super(message)). Basically it's saying: this is an exception with no message.
It's hard to tell exactly what's wrong without seeing any of your code though.

org.xxx.BBBException: null was thrown with null message (using default constructor). Throw it with some message (if it supports it):
throw new BBBException("Danger! High Voltage")
If this doesn't work, it means the BBBException(String msg) constructor is poorly written. It should be something like:
BBBException(String msg) {
super(msg);
}