ECFPParameters problem: org.xml.sax.SAXException

Hi

I'm trying to use fingerprints (ECFP) but when I try to create a configuration file I get an exception.  (Mac OS X).  Here is the code:

ECFPParameters ecfpParameters = new ECFPParameters(new File("/Applications/ChemAxon/JChem/examples/config/ecfp.xml"))

Here is the exception:

Warning: Caught exception attempting to use SAX to load a SAX XMLReader 

Warning: Exception was: org.xml.sax.SAXException: Can't create default XMLReader; is system property org.xml.sax.driver set?

Warning: I will print the stack trace then carry on using the default SAX parser

org.xml.sax.SAXException: Can't create default XMLReader; is system property org.xml.sax.driver set?

at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(Unknown Source)

at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:83)

at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)

at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)

at org.dom4j.io.SAXReader.read(SAXReader.java:435)

at org.dom4j.io.SAXReader.read(SAXReader.java:264)

at chemaxon.descriptors.MDParameters.readFromXmlFile(MDParameters.java:885)

at chemaxon.descriptors.ECFPParameters.<init>(ECFPParameters.java:137)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)

at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)

at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:57)

at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:182)

at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:190)

at generateFingerprints.run(generateFingerprints.groovy:27)

at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:258)

at groovy.lang.GroovyShell.run(GroovyShell.java:502)

at groovy.lang.GroovyShell.run(GroovyShell.java:491)

at groovy.ui.GroovyMain.processOnce(GroovyMain.java:650)

at groovy.ui.GroovyMain.run(GroovyMain.java:381)

at groovy.ui.GroovyMain.process(GroovyMain.java:367)

at groovy.ui.GroovyMain.processArgs(GroovyMain.java:126)

at groovy.ui.GroovyMain.main(GroovyMain.java:106)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:106)

at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:128)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

Caught: chemaxon.descriptors.MDParametersException: Bad XML config file.

chemaxon.descriptors.MDParametersException: Bad XML config file.

at chemaxon.descriptors.MDParameters.readFromXmlFile(MDParameters.java:896)

at chemaxon.descriptors.ECFPParameters.<init>(ECFPParameters.java:137)

at generateFingerprints.run(generateFingerprints.groovy:27)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

Caused by: org.dom4j.DocumentException: Can't create default XMLReader; is system property org.xml.sax.driver set? Nested exception: Can't create default XMLReader; is system property org.xml.sax.driver set?

at org.dom4j.io.SAXReader.read(SAXReader.java:484)

at org.dom4j.io.SAXReader.read(SAXReader.java:264)

at chemaxon.descriptors.MDParameters.readFromXmlFile(MDParameters.java:885)

... 3 more

Hi David,

 

I moved your record to the appropriate topic. My colleagues will answer you in short time.

 

Best regards,

Norbert 

Dear David,

 

Could you post the JChem version, Java version and OS version you used? Could you try to execute ECFP creation code using bare Java?

 

Regards,

Gabor

Thank you, here is the info:

 

JChem version:  14.7.14.0  (from this file:  jchem-14.7.14.0-macos.dmg)

Java version:  1.7.0_60

OS:  Mac OS X 10.9.4

 

It does work with plain java actually.

Dear David,

 

Thanks for the info. I suspect classpath/class loading problem with the groovy launching. Is there a "fork JVM" option in your environment?

 

Regards,

Gabor

Hi

Thank you - I'm not sure how to do that - I'm using IntelliJ.  A quick google didn't turn up how to do it (there was an entry on forking tests).

I had written it as a Groovy script, but then I re-wrote it as a Main class and executed it as an application and it worked.  I then modified my Groovy script to include an additional external library (apache commons math) and that worked.

I would like to pursue why this doesn't work as a Groovy script, if possible.

Dear David,

 

Glad to hear that working around the problem was possible.

To pursue the cause of the original problem i would recommend to follow the execution (based on the stack trace) of the problematic part simultaneously in both environment (standalone java vs Groovy script).

The relevant parts from ChemAxon sources:

// Import statements

import org.dom4j.Document;
import org.dom4j.io.SAXReader;

SAXReader reader = null; // Declaring reader
reader = new SAXReader(); // Creating reder
Document doc = reader.read( file );            // MDParameters.java:885; file is the passed File reference

The dom4j classes are declared in the dom4j-1.6.1.jar file. Online sources to follow stack trace can be found at http://grepcode.com/file/repo1.maven.org/maven2/dom4j/dom4j/1.6.1/org/dom4j/io/SAXReader.java?av=f#264

At a first glance the first possible difference in the execution paths is in SAXHelper.java, in line 78: http://grepcode.com/file/repo1.maven.org/maven2/dom4j/dom4j/1.6.1/org/dom4j/io/SAXHelper.java#78

In the failing execution org.dom4j.io.SAXHelper.createXMLReaderViaJaxp() must return null; in the not failing execution this method might return a not null value. I would recommend to check this first. (I think you need to put your code in org.dom4j.io package and subclass SAXHelper or use java reflection/setAccessible to invoke it)

If there is no difference then then the exception must come from the JRE (http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b27/org/xml/sax/helpers/XMLReaderFactory.java#133); i think duplicating the source of this method and executing step by step or printing trace info should yield further info.

 

Regards,

Gabor

Thank you Gabor!  I'll let you know what I find.