java.net.UnknownHostException: josm.openstreetmap.de

[richlv]

JOSM fails to start up if there's a brief glitch in the network at the right time.

java.net.UnknownHostException: josm.openstreetmap.de
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:196)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)
	at java.net.Socket.connect(Socket.java:606)
	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:287)
	at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:292)
	at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:395)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:203)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
	at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1046)
	at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1044)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:784)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1043)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:189)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
	at sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:92)
	at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1490)
	at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1488)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:784)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1487)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
	at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)
	at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)
	at com.sun.deploy.net.BasicHttpRequest.doHeadRequestEX(Unknown Source)
	at com.sun.deploy.cache.ResourceProviderImpl.checkUpdateAvailable(Unknown Source)
	at com.sun.deploy.cache.ResourceProviderImpl.isUpdateAvailable(Unknown Source)
	at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
	at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
	at com.sun.javaws.Launcher.updateFinalLaunchDesc(Unknown Source)
	at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
	at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
	at com.sun.javaws.Launcher.launch(Unknown Source)
	at com.sun.javaws.Main.launchApp(Unknown Source)
	at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
	at com.sun.javaws.Main.access$000(Unknown Source)
	at com.sun.javaws.Main$1.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:748)

[richlv]

JOSM info (after it starts up on the next attempt :) ):

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-08-02 19:44:04 +0200 (Mon, 02 Aug 2021)
Build-Date:2021-08-02 18:26:20
Revision:18118
Relative:URL: ^/trunk

Identification: JOSM/1.5 (18118 en_GB) Mac OS X 10.15.7
OS Build number: Mac OS X 10.15.7 (19H1323)
Memory Usage: 774 MB / 3641 MB (257 MB allocated, but free)
Java version: 1.8.0_301-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.apple.laf.AquaLookAndFeel
Screen: Display 69733382 1680×1050 (scaling 1.00×1.00)
Maximum Screen Size: 1680×1050
Best cursor sizes: 16×16→16×16, 32×32→32×32
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_GB
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlp.tk=awt, -Djnlpx.jvm=<java.home>/bin/java, -Djnlpx.splashport=-1, -Djnlpx.home=<java.home>/bin, -Djnlpx.remove=false, -Djnlpx.offline=false, -Djnlpx.relaunch=true, -Djnlpx.session.data=/var/folders/nl/flqxqsmj5q963r7tcnfrdt3c0000gn/T/session6633100231126147494, -Djnlpx.heapsize=NULL,NULL, -Djava.security.policy=file:<java.home>/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.origFilenameArg=/Users/richlv/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-72e8e992, -Dsun.awt.warmup=true, -Djava.security.manager]

Plugins:
+ HouseNumberTaggingTool (35640)
+ InfoMode (35543)
+ Mapillary (2.0.0-alpha.30-dirty)
+ PicLayer (1.0.1)
+ apache-commons (35524)
+ apache-http (35589)
+ buildings_tools (35756)
+ dataimport (35640)
+ ejml (35458)
+ geotools (35458)
+ imagery_offset_db (35640)
+ javafx-osx (35655)
+ jaxb (35543)
+ jna (35662)
+ jts (35458)
+ measurement (35640)
+ opendata (35640)
+ pbf (35720)
+ photo_geotagging (35783)
+ reverter (35732)
+ utilsplugin2 (35792)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1

[Don-vip]

Well, when running from WebStart there's nothing we can do in this situation. No JOSM code is involved here.

[richlv]

Got it, thank you for the info :)