[core] Fix XmlEnvironment namespace: Use default namespace (not element's)
Assume the element
<foo:bar xmlns='namespace' xmlns:foo='foo-namespace'/>

then the <bar/> element's namespace is 'foo-namespace', but the
default namespace is 'namespace'. And this is the namespace that
scopes into inner elements.

Rework WebSocket code
Related to SMACK-835.

[extensions] Use StanzaView as parameter type in BoBDataExtension.from()
BoBDataExtensions can also appear in IQs (Registration IQ), and
potentially also Presence stanzas.

Fixes SMACK-901.

[xdata] Fix NPE in DataForm.Builder.addItem()
Fixes SMACK-900.

Merge pull request #455 from Flowdalic/fix-data-form-npe
[xdata] Fix NPE in DataForm.Builder.addItem()

Merge branch '4.4'

[core] Fix XmlEnvironment namespace: Use default namespace (not element's)
Assume the element
<foo:bar xmlns='namespace' xmlns:foo='foo-namespace'/>

then the <bar/> element's namespace is 'foo-namespace', but the
default namespace is 'namespace'. And this is the namespace that
scopes into inner elements.

[extensions] Use StanzaView as parameter type in BoBDataExtension.from()
BoBDataExtensions can also appear in IQs (Registration IQ), and
potentially also Presence stanzas.

Fixes SMACK-901.

[extensions] Use StanzaView as parameter type in BoBDataExtension.from()
BoBDataExtensions can also appear in IQs (Registration IQ), and
potentially also Presence stanzas.

Fixes SMACK-901.

Merge pull request #455 from Flowdalic/fix-data-form-npe
[xdata] Fix NPE in DataForm.Builder.addItem()

Merge branch '4.4'

[xdata] Fix NPE in DataForm.Builder.addItem()
Fixes SMACK-900.

[core] Fix XmlEnvironment namespace: Use default namespace (not element's)
Assume the element
<foo:bar xmlns='namespace' xmlns:foo='foo-namespace'/>

then the <bar/> element's namespace is 'foo-namespace', but the
default namespace is 'namespace'. And this is the namespace that
scopes into inner elements.

Rework WebSocket code
Related to SMACK-835.

Merge branch '4.4'

[README] Switch "build status" badge from Travis to Github Actions
This also renames the CI workflow from "Smack CI" to just "CI".

Merge pull request #456 from Flowdalic/coveralls
[gradle] Bump coveralls-gradle-plugin to 2.10.2

[caps] Check for null in EntityCapsManager.addCapsExtension()
To avoid a NPE, we check for null in addCapsExtension.

Fixes SMACK-899.

Merge pull request #454 from Flowdalic/readme-build-status-github-actions
[README] Switch "build status" badge from Travis to Github Actions

[gradle] Bump coveralls-gradle-plugin to 2.10.2
This should make it work with Github Actions.

Merge pull request #453 from Flowdalic/fix-caps-npe
[caps] Check for null in EntityCapsManager.addCapsExtension()

Merge pull request #454 from Flowdalic/readme-build-status-github-actions
[README] Switch "build status" badge from Travis to Github Actions

[caps] Check for null in EntityCapsManager.addCapsExtension()
To avoid a NPE, we check for null in addCapsExtension.

Fixes SMACK-899.

Merge pull request #455 from Flowdalic/fix-data-form-npe
[xdata] Fix NPE in DataForm.Builder.addItem()

Merge pull request #453 from Flowdalic/fix-caps-npe
[caps] Check for null in EntityCapsManager.addCapsExtension()

[xdata] Fix NPE in DataForm.Builder.addItem()
Fixes SMACK-900.

[README] Switch "build status" badge from Travis to Github Actions
This also renames the CI workflow from "Smack CI" to just "CI".

Merge pull request #456 from Flowdalic/coveralls
[gradle] Bump coveralls-gradle-plugin to 2.10.2

[gradle] Bump coveralls-gradle-plugin to 2.10.2
This should make it work with Github Actions.

Merge pull request #454 from Flowdalic/readme-build-status-github-actions
[README] Switch "build status" badge from Travis to Github Actions

[caps] Check for null in EntityCapsManager.addCapsExtension()
To avoid a NPE, we check for null in addCapsExtension.

Fixes SMACK-899.

Merge pull request #453 from Flowdalic/fix-caps-npe
[caps] Check for null in EntityCapsManager.addCapsExtension()

[README] Switch "build status" badge from Travis to Github Actions
This also renames the CI workflow from "Smack CI" to just "CI".

Merge branch '4.4'

Merge pull request #451 from Flowdalic/github-actions
Add GitHub CI actions

Merge branch '4.4'

[core] AbstractProvider should also consider TypeVariable
aTalk shows the following exception:

2020-12-14 12:11:13.704 7370-30976/org.atalk.android E/AndroidRuntime: FATAL EXCEPTION: AccountManager.loadStoredAccounts
    Process: org.atalk.android, PID: 7370
    java.lang.AssertionError: Element type 'EE' is neither of type Class or ParameterizedType
        at org.jivesoftware.smack.provider.AbstractProvider.<init>(AbstractProvider.java:46)
        at org.jivesoftware.smack.provider.Provider.<init>(Provider.java:40)
        at org.jivesoftware.smack.provider.ExtensionElementProvider.<init>(ExtensionElementProvider.java:29)
        at org.xmpp.extensions.DefaultExtensionElementProvider.<init>(DefaultExtensionElementProvider.java:43)
        at org.xmpp.extensions.coin.CoinIQProvider.<init>(CoinIQProvider.java:46)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderServiceJabberImpl.initialize(ProtocolProviderServiceJabberImpl.java:2091)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderFactoryJabberImpl.createService(ProtocolProviderFactoryJabberImpl.java:121)
        at net.java.sip.communicator.service.protocol.ProtocolProviderFactory.loadAccount(ProtocolProviderFactory.java:934)
        at net.java.sip.communicator.service.protocol.AccountManager.doLoadStoredAccounts(AccountManager.java:139)
        at net.java.sip.communicator.service.protocol.AccountManager.loadStoredAccounts(AccountManager.java:294)
        at net.java.sip.communicator.service.protocol.AccountManager.runInLoadStoredAccountsThread(AccountManager.java:394)
        at net.java.sip.communicator.service.protocol.AccountManager.access$000(AccountManager.java:36)
        at
                net.java.sip.communicator.service.protocol.AccountManager$1.run(AccountManager.java:329)

where CoinIQProvider line 46-47 [1] reads

    private final DefaultExtensionElementProvider<URIsExtension> urisProvider
            = new
                        DefaultExtensionElementProvider<>(URIsExtension.class);

This fixes SMACK-898.

1: https://github.com/cmeng-git/atalk-android/blob/f61f264312ed9298b96a132c3000dc1031489a74/aTalk/src/main/java/org/xmpp/extensions/coin/CoinIQProvider.java#L47

Merge pull request #452 from Flowdalic/abstract-provider-element-type
[core] AbstractProvider should also consider TypeVariable

[core] AbstractProvider should also consider TypeVariable
aTalk shows the following exception:

2020-12-14 12:11:13.704 7370-30976/org.atalk.android E/AndroidRuntime: FATAL EXCEPTION: AccountManager.loadStoredAccounts
    Process: org.atalk.android, PID: 7370
    java.lang.AssertionError: Element type 'EE' is neither of type Class or ParameterizedType
        at org.jivesoftware.smack.provider.AbstractProvider.<init>(AbstractProvider.java:46)
        at org.jivesoftware.smack.provider.Provider.<init>(Provider.java:40)
        at org.jivesoftware.smack.provider.ExtensionElementProvider.<init>(ExtensionElementProvider.java:29)
        at org.xmpp.extensions.DefaultExtensionElementProvider.<init>(DefaultExtensionElementProvider.java:43)
        at org.xmpp.extensions.coin.CoinIQProvider.<init>(CoinIQProvider.java:46)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderServiceJabberImpl.initialize(ProtocolProviderServiceJabberImpl.java:2091)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderFactoryJabberImpl.createService(ProtocolProviderFactoryJabberImpl.java:121)
        at net.java.sip.communicator.service.protocol.ProtocolProviderFactory.loadAccount(ProtocolProviderFactory.java:934)
        at net.java.sip.communicator.service.protocol.AccountManager.doLoadStoredAccounts(AccountManager.java:139)
        at net.java.sip.communicator.service.protocol.AccountManager.loadStoredAccounts(AccountManager.java:294)
        at net.java.sip.communicator.service.protocol.AccountManager.runInLoadStoredAccountsThread(AccountManager.java:394)
        at net.java.sip.communicator.service.protocol.AccountManager.access$000(AccountManager.java:36)
        at
                net.java.sip.communicator.service.protocol.AccountManager$1.run(AccountManager.java:329)

where CoinIQProvider line 46-47 [1] reads

    private final DefaultExtensionElementProvider<URIsExtension> urisProvider
            = new
                        DefaultExtensionElementProvider<>(URIsExtension.class);

This fixes SMACK-898.

1: https://github.com/cmeng-git/atalk-android/blob/f61f264312ed9298b96a132c3000dc1031489a74/aTalk/src/main/java/org/xmpp/extensions/coin/CoinIQProvider.java#L47

Merge pull request #452 from Flowdalic/abstract-provider-element-type
[core] AbstractProvider should also consider TypeVariable

Merge pull request #451 from Flowdalic/github-actions
Add GitHub CI actions

[core] AbstractProvider should also consider TypeVariable
aTalk shows the following exception:

2020-12-14 12:11:13.704 7370-30976/org.atalk.android E/AndroidRuntime: FATAL EXCEPTION: AccountManager.loadStoredAccounts
    Process: org.atalk.android, PID: 7370
    java.lang.AssertionError: Element type 'EE' is neither of type Class or ParameterizedType
        at org.jivesoftware.smack.provider.AbstractProvider.<init>(AbstractProvider.java:46)
        at org.jivesoftware.smack.provider.Provider.<init>(Provider.java:40)
        at org.jivesoftware.smack.provider.ExtensionElementProvider.<init>(ExtensionElementProvider.java:29)
        at org.xmpp.extensions.DefaultExtensionElementProvider.<init>(DefaultExtensionElementProvider.java:43)
        at org.xmpp.extensions.coin.CoinIQProvider.<init>(CoinIQProvider.java:46)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderServiceJabberImpl.initialize(ProtocolProviderServiceJabberImpl.java:2091)
        at net.java.sip.communicator.impl.protocol.jabber.ProtocolProviderFactoryJabberImpl.createService(ProtocolProviderFactoryJabberImpl.java:121)
        at net.java.sip.communicator.service.protocol.ProtocolProviderFactory.loadAccount(ProtocolProviderFactory.java:934)
        at net.java.sip.communicator.service.protocol.AccountManager.doLoadStoredAccounts(AccountManager.java:139)
        at net.java.sip.communicator.service.protocol.AccountManager.loadStoredAccounts(AccountManager.java:294)
        at net.java.sip.communicator.service.protocol.AccountManager.runInLoadStoredAccountsThread(AccountManager.java:394)
        at net.java.sip.communicator.service.protocol.AccountManager.access$000(AccountManager.java:36)
        at
                net.java.sip.communicator.service.protocol.AccountManager$1.run(AccountManager.java:329)

where CoinIQProvider line 46-47 [1] reads

    private final DefaultExtensionElementProvider<URIsExtension> urisProvider
            = new
                        DefaultExtensionElementProvider<>(URIsExtension.class);

This fixes SMACK-898.

1: https://github.com/cmeng-git/atalk-android/blob/f61f264312ed9298b96a132c3000dc1031489a74/aTalk/src/main/java/org/xmpp/extensions/coin/CoinIQProvider.java#L47

Merge pull request #452 from Flowdalic/abstract-provider-element-type
[core] AbstractProvider should also consider TypeVariable

Merge branch '4.4'

Merge pull request #451 from Flowdalic/github-actions
Add GitHub CI actions

Smack 4.4.1-SNAPSHOT

[extensions] Add BoBDataExtension getBobData() and getContentId()
Those two methods where missing after the BoB API redesign.

Fixes SMACK-896.

Merge branch '4.4'

[im] Update DirectoryRosterStore TODO note regarding Android API 26.

[im] DirectoryRosterStore.readEntry() should also catch IllegalArgumentException
Fixes SMACK-897.

Fix NPE in BoBIQ by adding XmlStringBuilder.optIntAttribute(String, Integer)
The method was missing and hence BoBIQ used optIntAttribute(String,
int) instead, which resulted in an NPE if the Integer was null.

Fixes SMACK-895.

[im] Update DirectoryRosterStore TODO note regarding Android API 26.

[im] DirectoryRosterStore.readEntry() should also catch IllegalArgumentException
Fixes SMACK-897.

Fix NPE in BoBIQ by adding XmlStringBuilder.optIntAttribute(String, Integer)
The method was missing and hence BoBIQ used optIntAttribute(String,
int) instead, which resulted in an NPE if the Integer was null.

Fixes SMACK-895.

[extensions] Add BoBDataExtension getBobData() and getContentId()
Those two methods where missing after the BoB API redesign.

Fixes SMACK-896.

Fix NPE in BoBIQ by adding XmlStringBuilder.optIntAttribute(String, Integer)
The method was missing and hence BoBIQ used optIntAttribute(String,
int) instead, which resulted in an NPE if the Integer was null.

Fixes SMACK-895.

Smack 4.4.1-SNAPSHOT

[im] Update DirectoryRosterStore TODO note regarding Android API 26.

[im] DirectoryRosterStore.readEntry() should also catch IllegalArgumentException
Fixes SMACK-897.

Merge branch '4.4'

[extensions] Add BoBDataExtension getBobData() and getContentId()
Those two methods where missing after the BoB API redesign.

Fixes SMACK-896.

Merge pull request #419 from adiaholic/bugFix
XmlEnvironment: Use correct method to obatain effective namespace.

Bump jXMPP version to 1.0.0

Merge pull request #407 from vanitasvitae/oxDeadCode
OX-IM: Remove redundant code to add self to recipients

Bump MiniDNS version to 1.0.0

[core] Fix log/exception message of XmppElementUtil
The Class.toString() already prefixes the resulting string with "class
", no need to state it explicitly in the log message that this is a
class.

Merge branch 'master' of github.com:igniterealtime/Smack

Merge pull request #408 from vanitasvitae/secretKeyBackupPassword
Allow user-supplied secret key backup passphrases

Merge pull request #406 from vanitasvitae/oxSecretKeyBackupRestore
OX: Improvements to Secret key backup restore function

Bump junit version to 5.6.2

Bump Error Prone version to 2.3.4 and fix new bug patterns

[core] Improve NumberUtil's exception message and fix javadoc

Update Message Archive Management (XEP-0313) support to urn:xmpp:mam:2
Fixes SMACK-890.

[experimental] Delcare methods as static when possible

Bump MiniDNS version to 0.4.0-alpha5

[core] Use UInt16 for ConnectionConfiguration 'port'

Bump jxmpp Version to 0.7.0-alpha6

Merge pull request #354 from vanitasvitae/smackomemoStyleFixes
omemo: style fixes

Merge pull request #350 from adiaholic/pepOverPubsub
Make use of `pep` instead of `pubsub` in GeoLocations

Add XmlEnvironment conscious ParserUtils.getXmlLang()
and unify parsing of common stanza attributes where this new method is
used.

Use XmlEnvironment.EMPTY instead of null in PacketParserUtils

Enable werror for javadoc and fix javadoc issues

Merge pull request #342 from fenek/fix-http-file-upload-header
Remove trailing semicolon in the header used in HttpFileUploadManager

Merge pull request #335 from bjalon/patch-3
Update processing.md

Merge pull request #320 from vanitasvitae/muc_joined_rooms_bookmarks_note
Add note about BookmarkManager to MUCManager

Smack 4.3.5-SNAPSHOT

Merge pull request #336 from bjalon/patch-4
Update gettingstarted.md

Merge branch '4.3'

Smack 4.3.4

Merge pull request #333 from adiaholic/docFix
DocFix in `NodeInformationProvider`

Deprecate setHostAddressByNameOrIp() and move logic into setHost()
in ConnectionConfiguration.Builder.

Fix log message format in Roster: s/{}/{0}/
The MessageFormat used by the JUL Logger requires integers between the
curly brackets (unlike SLF4J).

Fix whitespace errors in AbstractXMPPConnection

Merge pull request #334 from bjalon/patch-2
Update providers.md

Merge pull request #308 from adiaholic/SMACK-718
Prevent extremely long reply timeouts from being set.

Merge pull request #339 from bjalon/patch-5
Update muc.md

[core] Fix XmlEnvironment namespace: Use default namespace (not element's)
Assume the element
<foo:bar xmlns='namespace' xmlns:foo='foo-namespace'/>

then the <bar/> element's namespace is 'foo-namespace', but the
default namespace is 'namespace'. And this is the namespace that
scopes into inner elements.

Rework WebSocket code
Related to SMACK-835.

[extensions] Use StanzaView as parameter type in BoBDataExtension.from()
BoBDataExtensions can also appear in IQs (Registration IQ), and
potentially also Presence stanzas.

Fixes SMACK-901.

[xdata] Fix NPE in DataForm.Builder.addItem()
Fixes SMACK-900.

Merge pull request #455 from Flowdalic/fix-data-form-npe
[xdata] Fix NPE in DataForm.Builder.addItem()

Merge branch '4.4'

[core] Fix XmlEnvironment namespace: Use default namespace (not element's)
Assume the element
<foo:bar xmlns='namespace' xmlns:foo='foo-namespace'/>

then the <bar/> element's namespace is 'foo-namespace', but the
default namespace is 'namespace'. And this is the namespace that
scopes into inner elements.

[extensions] Use StanzaView as parameter type in BoBDataExtension.from()
BoBDataExtensions can also appear in IQs (Registration IQ), and
potentially also Presence stanzas.

Fixes SMACK-901.

[tcp] Mark SM as disabled prior resource binding
Otherwise we may send a SM ack request with the bind IQ request,
causing a stream error:

D/SMACK: SENT (0):
    <iq id='SETVB-74' type='set'>
      <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
      </bind>
    </iq>
    <r xmlns='urn:xmpp:sm:3'/>
D/SMACK: RECV (0):
    <iq id='SETVB-74' type='result'>
      <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
        <jid>
          snakeman@wiuwiu.de/eHeTGlCq
        </jid>
      </bind>
    </iq>
    <stream:error>
      <unsupported-stanza-type xmlns='urn:ietf:params:xml:ns:xmpp-streams'/>
    </stream:error>
    </stream:stream>

sinttest: delcare boolean in WaitForClosingStreamElementTest

resolver-dnsjava: bump to dnsjava 3.0 series

core: add shortcut via hash in EqualsUtil
Return false as soon as the hashed value does not match. This is
sound, since every class that implements equals(Object) should also
implement hashCode().

pep: Use EventItemsExtensionFilter

core: Add ExtensionElementFilter

geoloc: do not set error in integration test
As error is deprecated. And should be marked as such.

pubsub: Add EventItemsExtensionFilter

core: delete deprecated ToFilter
This filter was marked deprecated in 2017 with 5d0dd49e6 ("Introduce
ToMatchesFilter"), time to delete it.

geoloc: GeoLocation constructor should have Builder as sole paramter
Also remove that (broken) "Error and accuracy set" warning, but
mark (get|set)Error() as deprecated.

pep: cleanup pep users API
Use EntityBareJid just as its done within PepManager. There is no need
for AsyncButOrdered in the PEP user managers, as PepManager already
takes care of that. Also the message carrying the PEP event should
always be the last parameter of the callbacks, as it is the least
important piece of information.

pep: improve pep event filter

core: delete deprecated filters
Those where deprecated in 2015 with d4a6d8e65 ("Rename
PacketFilter (and implementing classes) and PacketExtension"), now it
is time to delete them.

Merge pull request #379 from akrherz/travis
update Travis-CI badge on README.md

resolver-dnsjava: change description
The recommended resolver on Android is MiniDNS.

core: remove deprecated methods in PacketUtil
Those where deprecated in 2015 with 8409dddff ("Add
PacketUtil.extensionElementFrom()"), and in 2017 with
2288825b1 ("Retain smack-core API").

core: do not init() closingStreamReceived sync point in initState()
The initState() method is also called in disconnect(). And if we reset
the closingStreamReceived sync point at disconnect, it will break the
WaitForClosingStreamElementTest integration test.

Merge pull request #382 from vanitasvitae/typo
Fix typo in XmppElementUtil

sinttest: only append subdescriptions if there are any

geoloc: make global setter static

pep: improve API, add PepEventListener
The geoloc, mood and usertune PEP users showed a pattern. Instead of
repeating this pattern every time, let PepManager do the hard work

sinttest: signal failure if geoloc element does not match

sinttest: also check for length of subdescriptions varargs

geoloc: make GeoLocation implement hashCode() and equals(Object)

omemo: fix javadoc issue with OracleJDK8
CI runs fail using OracleJDK8 with

/home/travis/build/igniterealtime/Smack/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement_VAxolotl.java:30:
warning - Tag @see: missing final '>':
"<ahref="https://xmpp.org/extensions/xep-0384.html#usecases-announcing">XEP-0384:
OMEMO Encryption (Example 3)</a>."

Other JDKs do not report such an error.

sinttest: migrate to JUnit5, drop JUnit4
The before/after class annotations are now no longer borrowed from
JUnit.

Also some integration tests used @After and/or @Before from JUnit,
which was never supported nor had any effected. Those methods got
deleted. But since there appears to be a desire for such a
functionality in sinttest, we should consider adding one.

omemo: fix javadoc issue with OracleJDK8
CI runs fail using OracleJDK8 with

/home/travis/build/igniterealtime/Smack/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/element/OmemoBundleElement_VAxolotl.java:30:
warning - Tag @see: missing final '>':
"<ahref="https://xmpp.org/extensions/xep-0384.html#usecases-announcing">XEP-0384:
OMEMO Encryption (Example 3)</a>."

Other JDKs do not report such an error.

sinttest: migrate to JUnit5, drop JUnit4
The before/after class annotations are now no longer borrowed from
JUnit.

Also some integration tests used @After and/or @Before from JUnit,
which was never supported nor had any effected. Those methods got
deleted. But since there appears to be a desire for such a
functionality in sinttest, we should consider adding one.

sinttest: only append subdescriptions if there are any

resolver-dnsjava: change description
The recommended resolver on Android is MiniDNS.

geoloc: make global setter static

resolver-dnsjava: bump to dnsjava 3.0 series

gradle: Switch to 'maven-publish' plugin

gradle: Remove archives configuration
and FileTestUtil in favor of commons-io. This is required because
Eclipse won't put src/test code into the classpath of src/main
code (even though gradle was configured with an according
dependency).

gradle: Use project(':foo') intead of project(path: ':foo') when possible

travis: Add javadocAll to 'script' gradle targets
to ensure that javadocAll works correctly. A nice side-effect, this
also ensures that the package-info.java symbolic links are still
correct and haven't been replaced by some IDE or editor with the
content of the link target.

Make "duplicate" package-info.java files symbolic links
This is needed for javadocAll since otherwhise there will be

smack-core/src/main/java/org/jivesoftware/smack/package-info.java:21:
        warning: a package-info.java file has already been seen for
        package org.jivesoftware.smack

warnings.

javadocAll: Set source to sourceCompatibility to work around bug
in JDK 11. See https://bugs.openjdk.java.net/browse/JDK-8217177

Fix whitespace errors in AbstractXMPPConnection

Use XMLInputFactory.newInstance() instead of newFactory()
As newFactory() is errornously marked as deprecated in Java 9 or
higher. See also https://bugs.openjdk.java.net/browse/JDK-8183519

travis: Also call 'install' target
to check if artifact creation is functional.

travis: Update the Ubuntu repositories

travis: Update cache configuration

smack-android/build.gradle: Use 'implementation' for smack-xmlparser-xpp3
which is the probably the better choice here anyway. And it also
prevents the following failure on POM creation:

$ gradle uploadArchives
> Task :smack-android:uploadArchives FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':smack-android:uploadArchives'.
> Could not publish configuration 'archives'
   > Could not write to file
   '/home/flo/data/code/smack/smack-android/build/poms/pom-default.xml'.

See also

https://discuss.gradle.org/t/gradle-fails-to-create-pom-with-the-configuration-to-scope-mapping-is-not-unique/32087

travis: Remove "sudo: false" as recommended by travis

travis: Use gradle 5.5.1

travis: Remove openjdk8, add openjdk(9|11)

Javadoc changes for Java 11 compatibility

travis: Use apt-get instead apt
It appears 'apt' is no longer available and the official documentation
only mentions apt-get.

Remove finalize() from AbstractXmppNioConnection

checkstyle: Use $config_loc for Java 11
Also move configuration files into "${rootProject}/config/checkstyle"
to follow convention over configuration.

See https://github.com/gradle/gradle/issues/8286#issuecomment-458145619

travis: Use Ubuntu 14.04 (Trusty)

Merge pull request #320 from vanitasvitae/muc_joined_rooms_bookmarks_note
Add note about BookmarkManager to MUCManager