[
https://issues.apache.org/jira/browse/XMLBEANS-612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dominik Stadler updated XMLBEANS-612:
-------------------------------------
Description:
The project [https://github.com/centic9/poi-on-android] allows to run Apache
POI as part of Android Apps and thus also uses XMLBeans.
When trying to update to Apache POI 5.2.2 and XMLBeans 5.1.0, I saw that there
is a problem with the Class-loading.
XMLBeans tries to do the following
{noformat}
cl.getResource("xyz.class") {noformat}
However on Android you cannot get class-resources this way.
It seems this is only done to prevent a ClassNotFoundException in the call to
{{Class.forName}} which follows.
Therefore I propose to change the code as follows so that we simply expect a
ClassNotFoundException instead of doing this separate lookup via getResource()
{noformat}
// BEGIN CHANGES
=========================================================================
//
// Simply remove this pre-check and handle ClassNotFoundException below
// as Android does not find .class-files in getResource()
//
// See
https://stackoverflow.com/questions/72616517/looking-up-class-files-via-classloader-getresource-on-android
// for a related question
//
/*if (cl.getResource(clName.replace(".", "/") + ".class") == null) {
// if the first class isn't found in the package, continue with the next
package
break;
}*/
try {
@SuppressWarnings("unchecked")
Class<? extends SchemaTypeLoader> cls = (Class<? extends SchemaTypeLoader>)
Class.forName(clName, true, cl);
list.add((SchemaTypeLoader) cls.getDeclaredField("typeSystem").get(null));
} catch (ClassNotFoundException e) {
// if the first class isn't found in the package, continue with the next
package
// this can happen and thus is ignored here
} catch (Exception e) {
throw new XmlRuntimeException(e);
}
// END-CHANGES
========================================================================={noformat}
Applying this change locally makes the project work on Android with Apache POI
5.2.2 and XMLBeans 5.1.0.
was:
The project [https://github.com/centic9/poi-on-android] allows to run Apache
POI as part of Android Apps and thus also uses XMLBeans.
When trying to update to Apache POI 5.2.0, I saw that there is a problem with
the SAX parser on Android as it fails when both features "namespaces" and
"namespace-prefix" are set to true.
XMLBeans currently does this in the class {{Locale.SaxLoader}} and thus an
Android Application crashes with an error "The 'namespace-prefix' feature is
not supported while the 'namespaces' feature is enabled."
Therefore I will introduce a system property which can be used to control the
SAX feature "namespace-prefixes" to be able to set it to "false" if required.
The full stacktrace is:
{noformat}
E/AndroidRuntime: FATAL EXCEPTION: main
Process: org.dstadler.poiandroidtest.poitest, PID: 26552
java.lang.RuntimeException: Unable to start activity
ComponentInfo{org.dstadler.poiandroidtest.poitest/org.dstadler.poiandroidtest.poitest.DocumentListActivity}:
java.lang.IllegalStateException: org.apache.poi.ooxml.POIXMLException: unable
to parse shared strings table
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.IllegalStateException:
org.apache.poi.ooxml.POIXMLException: unable to parse shared strings table
at
org.dstadler.poiandroidtest.poitest.DocumentListActivity.onCreate(DocumentListActivity.java:191)
at android.app.Activity.performCreate(Activity.java:6975)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: org.apache.poi.ooxml.POIXMLException: unable to parse shared
strings table
at
org.apache.poi.ooxml.POIXMLFactory.createDocumentPart(POIXMLFactory.java:68)
at
org.apache.poi.ooxml.POIXMLDocumentPart.read(POIXMLDocumentPart.java:661)
at org.apache.poi.ooxml.POIXMLDocument.load(POIXMLDocument.java:165)
at
org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:274)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.createWorkbook(XSSFWorkbookFactory.java:118)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:98)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:36)
at
org.apache.poi.ss.usermodel.WorkbookFactory.lambda$create$2(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory$$ExternalSyntheticLambda4.create(Unknown
Source:2)
at
org.apache.poi.ss.usermodel.WorkbookFactory.wp(WorkbookFactory.java:329)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:185)
at
org.dstadler.poiandroidtest.poitest.DocumentListActivity.onCreate(DocumentListActivity.java:81)
at android.app.Activity.performCreate(Activity.java:6975)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.io.IOException: unable to parse shared strings table
at
org.apache.poi.xssf.model.SharedStringsTable.readFrom(SharedStringsTable.java:136)
at
org.apache.poi.xssf.model.SharedStringsTable.<init>(SharedStringsTable.java:112)
at
org.apache.poi.xssf.usermodel.XSSFRelation$$ExternalSyntheticLambda14.init(Unknown
Source:2)
at
org.apache.poi.ooxml.POIXMLFactory.createDocumentPart(POIXMLFactory.java:61)
at
org.apache.poi.ooxml.POIXMLDocumentPart.read(POIXMLDocumentPart.java:661)
at org.apache.poi.ooxml.POIXMLDocument.load(POIXMLDocument.java:165)
at
org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:274)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.createWorkbook(XSSFWorkbookFactory.java:118)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:98)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:36)
at
org.apache.poi.ss.usermodel.WorkbookFactory.lambda$create$2(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory$$ExternalSyntheticLambda4.create(Unknown
Source:2)
at
org.apache.poi.ss.usermodel.WorkbookFactory.wp(WorkbookFactory.java:329)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:185)
at
org.dstadler.poiandroidtest.poitest.DocumentListActivity.onCreate(DocumentListActivity.java:81)
at android.app.Activity.performCreate(Activity.java:6975)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: org.apache.xmlbeans.XmlException: error: The 'namespace-prefix'
feature is not supported while the 'namespaces' feature is enabled.
at
org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:2565)
at
org.apache.xmlbeans.impl.store.Locale.lambda$parseToXmlObject$3(Locale.java:725)
at
org.apache.xmlbeans.impl.store.Locale$$ExternalSyntheticLambda4.parse(Unknown
Source:6)
at org.apache.xmlbeans.impl.store.Locale.syncWrap(Locale.java:498)
at
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:724)
at
org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:233)
at
org.apache.xmlbeans.impl.schema.AbstractDocumentFactory.parse(AbstractDocumentFactory.java:71)
at
org.apache.poi.xssf.model.SharedStringsTable.readFrom(SharedStringsTable.java:125)
at
org.apache.poi.xssf.model.SharedStringsTable.<init>(SharedStringsTable.java:112)
at
org.apache.poi.xssf.usermodel.XSSFRelation$$ExternalSyntheticLambda14.init(Unknown
Source:2)
at
org.apache.poi.ooxml.POIXMLFactory.createDocumentPart(POIXMLFactory.java:61)
at
org.apache.poi.ooxml.POIXMLDocumentPart.read(POIXMLDocumentPart.java:661)
at org.apache.poi.ooxml.POIXMLDocument.load(POIXMLDocument.java:165)
at
org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:274)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.createWorkbook(XSSFWorkbookFactory.java:118)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:98)
at
org.apache.poi.xssf.usermodel.XSSFWorkbookFactory.create(XSSFWorkbookFactory.java:36)
at
org.apache.poi.ss.usermodel.WorkbookFactory.lambda$create$2(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory$$ExternalSyntheticLambda4.create(Unknown
Source:2)
at
org.apache.poi.ss.usermodel.WorkbookFactory.wp(WorkbookFactory.java:329)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:224)
at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:185)
at
org.dstadler.poiandroidtest.poitest.DocumentListActivity.onCreate(DocumentListActivity.java:81)
at android.app.Activity.performCreate(Activity.java:6975)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
E/AndroidRuntime: Caused by: org.xml.sax.SAXNotSupportedException: The
'namespace-prefix' feature is not supported while the 'namespaces' feature is
enabled.
at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:258)
at
org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:2538)
... 34 more {noformat}
> Adjust Class loading for using XMLBeans on Android
> --------------------------------------------------
>
> Key: XMLBEANS-612
> URL: https://issues.apache.org/jira/browse/XMLBEANS-612
> Project: XMLBeans
> Issue Type: New Feature
> Affects Versions: Version 5.0.3
> Reporter: Dominik Stadler
> Assignee: Dominik Stadler
> Priority: Major
> Fix For: Version 5.1.0
>
>
> The project [https://github.com/centic9/poi-on-android] allows to run Apache
> POI as part of Android Apps and thus also uses XMLBeans.
> When trying to update to Apache POI 5.2.2 and XMLBeans 5.1.0, I saw that
> there is a problem with the Class-loading.
> XMLBeans tries to do the following
> {noformat}
> cl.getResource("xyz.class") {noformat}
> However on Android you cannot get class-resources this way.
> It seems this is only done to prevent a ClassNotFoundException in the call to
> {{Class.forName}} which follows.
>
> Therefore I propose to change the code as follows so that we simply expect a
> ClassNotFoundException instead of doing this separate lookup via getResource()
> {noformat}
> // BEGIN CHANGES
> =========================================================================
> //
> // Simply remove this pre-check and handle ClassNotFoundException below
> // as Android does not find .class-files in getResource()
> //
> // See
> https://stackoverflow.com/questions/72616517/looking-up-class-files-via-classloader-getresource-on-android
> // for a related question
> //
> /*if (cl.getResource(clName.replace(".", "/") + ".class") == null) {
> // if the first class isn't found in the package, continue with the next
> package
> break;
> }*/
> try {
> @SuppressWarnings("unchecked")
> Class<? extends SchemaTypeLoader> cls = (Class<? extends
> SchemaTypeLoader>) Class.forName(clName, true, cl);
> list.add((SchemaTypeLoader) cls.getDeclaredField("typeSystem").get(null));
> } catch (ClassNotFoundException e) {
> // if the first class isn't found in the package, continue with the next
> package
> // this can happen and thus is ignored here
> } catch (Exception e) {
> throw new XmlRuntimeException(e);
> }
> // END-CHANGES
> ========================================================================={noformat}
>
> Applying this change locally makes the project work on Android with Apache
> POI 5.2.2 and XMLBeans 5.1.0.
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