sschiavoni
commented
10 years ago Comment #1 originally posted by shakusa@google.com on 2011-04-11T01:34:39.000Z:
There are 2 problems:
- The code can't find the relaxng schema used to validate atom. This isn't breaking anything in the code, but it's causing a lot of the logging
- The code can't find the xsd schema used to valdiate both rss and cap. This is causing the IllegalArgumentException that's killing the program.
For 1:
It seems that there are problems with Android such that when it repackages JAR files, it leaves out descriptors in META-INF/services. This is mentioned on other sites like http://wiki.restlet.org/docs_2.0/13-restlet/275-restlet/266-restlet.html
That means http://code.google.com/p/cap-library/source/browse/java/config/META-INF/services/javax.xml.validation.SchemaFactory doesn't have any effect.
There is a workaround to this one; you can use System.setProperty at http://code.google.com/p/cap-library/source/browse/java/src/com/google/publicalerts/cap/feed/CapFeedParser.java# 83, which android allows, eg
System.setProperty(
SchemaFactory.class.getName() + ":" + Constants.RELAXNG_COMPACT_URI,
"com.thaiopensource.relaxng.jaxp.CompactSyntaxSchemaFactory");For 2:
After a lot of digging, I found the related Android bug:
http://code.google.com/p/android/issues/detail?id=7395 (3268630 internally)
Quoting that bug: Our XML APIs (including SAX, XmlPull and DOM) don't support any of the following: XML Schema validation
I think there is a workaround here, too. Part of the workaround is to bundle the xerces jar into the apk. See for example: http://stackoverflow.com/questions/2651804/xerces-on-android
Then there have to be similar code changes as for 1. that set appropriate system properties to workaround the META-INF issue. Here: http://code.google.com/p/cap-library/source/browse/java/src/com/google/publicalerts/cap/feed/CapFeedParser.java# 102 and here: http://code.google.com/p/cap-library/source/browse/java/src/com/google/publicalerts/cap/CapXmlParser.java# 74
AnthoSi
Original issue 15 created by shakusa@google.com on 2011-04-11T01:20:22.000Z:
wondering if you can help me to get your Cap library running on Android.
It seems to be having a problem resolving the schema factory:
No schema factory available for http://www.iana.org/assignments/media-types/application/relax-ng-compact-syntax
here is the Schema Factory Android page:
http://developer.android.com/reference/javax/xml/validation/SchemaFactory.html
Thanks and regards, Eric
I am seeing the following exception when attempting to parse a cap feed:
I/EventMonitor: ( 717): <?xml version='1.0' encoding='ISO-8859-1'?> <rss version='2.0'> <channel> <title>Hawaii Local Storm Reports 30 day archive</title> <link>http://www.prh.noaa.gov/hnl/pages/ls r.php</link> <description>Local Storm Reports issued in the last 30 days from the National Weather Service Forecast Office in Honolulu, Hawaii.</description> <language>en-us</language> <managingEdi tor>W-HFO.Webmaster@noaa.gov</managingEditor> <webMaster>W-HFO.Webmaster@noaa.gov</webMaster> <lastBuildDate>Sun, 3 Apr 2011 13:42:35 +0000</lastBuildDate> <image> <url>http://weather.gov/images /xml_logo.gif</url> <title>Hawaii Local Storm Reports 30 day archive</title> <link>http://www.prh.noaa.gov/hnl/pages/lsr.php</link> </image><item><title> NON-TSTM WND D - CORRECTED PRELIMINARY LO CAL STORM REPORT...CORRECTED</title><link>http://www.prh.noaa.gov/data/HFO/LSRHFO.1103172036</link><description>1018 AM NON-TSTM WND DMG HONOLULU 21.31N 157.86W...</description><pub Date>Thu, 17 Mar 2011 10:36:00 +1000</pubDate></item><item><title> NON-TSTM WND D PRELIMINARY LOCAL STORM REPORT</title><link>http://www.prh.noaa.gov/data/HFO/LSRHFO.1103171819</link><description>0807 AM NON-TSTM WND DMG HONOLULU 21.31N 157.86W...</description><pubDate>Thu, 17 Mar 2011 8:17:00 +1000</pubDate></item><item><title> TSTM WND DMG , HEAVY RAIN PRELIMINARY LOCAL STOR M REPORT</title><link>http://www.prh.noaa.gov/data/HFO/LSRHFO.1103041822</link><description>0415 AM TSTM WND DMG 2 E WAIPAHU 21.39N 157.98W...</description><pubDate>Fri, 04 Mar 201 1 8:22:00 +1000</pubDate></item><item><title> HEAVY RAIN PRELIMINARY LOCAL STORM REPORT</title><link>http://www.prh.noaa.gov/data/HFO/LSRHFO.1103041642</link><description>0237 AM HEAVY RAIN 4 N KOLOA 21.96N 159.46W...</description><pubDate>Fri, 04 Mar 2011 2:42:00 +1000</pubDate></item> </channel> </rss> W/CapFeedParser( 717): No schema factory available for http://www.iana.org/assignments/media-types/application/relax-ng-compact-syntax W/CapFeedParser( 717): java.lang.IllegalArgumentException: http://www.iana.org/assignments/media-types/application/relax-ng-compact-syntax W/CapFeedParser( 717): at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:192) W/CapFeedParser( 717): at com.google.publicalerts.cap.feed.CapFeedParser.loadRelaxNgSchema(CapFeedParser.java:85) W/CapFeedParser( 717): at com.google.publicalerts.cap.feed.CapFeedParser.<clinit>(CapFeedParser.java:78) W/CapFeedParser( 717): at net.cs76.projects.mobilealert.model.EventMonitor.getAlerts(EventMonitor.java:72) W/CapFeedParser( 717): at net.cs76.projects.mobilealert.WelcomeActivity$MonitorForEventsTask.doInBackground(WelcomeActivity.java:210) W/CapFeedParser( 717): at net.cs76.projects.mobilealert.WelcomeActivity$MonitorForEventsTask.doInBackground(WelcomeActivity.java:1) W/CapFeedParser( 717): at android.os.AsyncTask$2.call(AsyncTask.java:252) W/CapFeedParser( 717): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) W/CapFeedParser( 717): at java.util.concurrent.FutureTask.run(FutureTask.java:137) W/CapFeedParser( 717): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081) W/CapFeedParser( 717): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574) W/CapFeedParser( 717): at java.lang.Thread.run(Thread.java:1020) W/dalvikvm( 717): Exception Ljava/lang/IllegalArgumentException; thrown while initializing Lcom/google/publicalerts/cap/feed/CapFeedParser; W/dalvikvm( 717): threadid=9: thread exiting with uncaught exception (group=0x40014760) E/AndroidRuntime( 717): FATAL EXCEPTION: AsyncTask # 1 E/AndroidRuntime( 717): java.lang.RuntimeException: An error occured while executing doInBackground() E/AndroidRuntime( 717): at android.os.AsyncTask$3.done(AsyncTask.java:266) E/AndroidRuntime( 717): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) E/AndroidRuntime( 717): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) E/AndroidRuntime( 717): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) E/AndroidRuntime( 717): at java.util.concurrent.FutureTask.run(FutureTask.java:137) E/AndroidRuntime( 717): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081) E/AndroidRuntime( 717): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574) E/AndroidRuntime( 717): at java.lang.Thread.run(Thread.java:1020) E/AndroidRuntime( 717): Caused by: java.lang.ExceptionInInitializerError E/AndroidRuntime( 717): at net.cs76.projects.mobilealert.model.EventMonitor.getAlerts(EventMonitor.java:72) E/AndroidRuntime( 717): at net.cs76.projects.mobilealert.WelcomeActivity$MonitorForEventsTask.doInBackground(WelcomeActivity.java:210) E/AndroidRuntime( 717): at net.cs76.projects.mobilealert.WelcomeActivity$MonitorForEventsTask.doInBackground(WelcomeActivity.java:1) E/AndroidRuntime( 717): at android.os.AsyncTask$2.call(AsyncTask.java:252) E/AndroidRuntime( 717): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) E/AndroidRuntime( 717): ... 4 more E/AndroidRuntime( 717): Caused by: java.lang.IllegalArgumentException: http://www.w3.org/2001/XMLSchema E/AndroidRuntime( 717): at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:192) E/AndroidRuntime( 717): at com.google.publicalerts.cap.feed.CapFeedParser.loadXsd(CapFeedParser.java:103) E/AndroidRuntime( 717): at com.google.publicalerts.cap.feed.CapFeedParser.<clinit>(CapFeedParser.java:80) E/AndroidRuntime( 717): ... 9 more W/ActivityManager( 72): Force finishing activity net.cs76.projects.mobilealert/.WelcomeActivity W/WindowManager( 72): Failure taking screenshot for (216x135) to layer 21010 I/TtsService( 454): Stopping