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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MGNLUI-2819] No trace in logs when a Vaadin internal error occurs (e.g. PaintException)</title>
                <link>https://jira.magnolia-cms.com/browse/MGNLUI-2819</link>
                <project id="10625" key="MGNLUI">Magnolia UI</project>
                    <description>&lt;p&gt;Up till now (see original ticket), we (I) disabled &lt;tt&gt;VaadinSession&lt;/tt&gt;&apos;s default error handler by setting it to &lt;em&gt;null&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;This was probably done so that only our own error handler (which is registered on the UI, not the session) deals with Vaadin errors, avoiding the big fat red boxes. Our &lt;tt&gt;AdmincentralErrorHandler&lt;/tt&gt; sends message to the pulse.&lt;/p&gt;

&lt;p&gt;Now, although it doesn&apos;t even prevent the big fat red boxes to show up, it has the definite disadvantage to swallow  Vaadin internal errors like PaintExceptions &#8212; those that are obviously not handled at UI level, because they occur while the UIDL response is being written. &lt;/p&gt;

&lt;p&gt;We need to either restore the session-level &lt;tt&gt;DefaultErrorHandler&lt;/tt&gt;, which is enough for the exceptions to appear in the logs, or add a specific handler of our own instead. Just anything but null really.&lt;/p&gt;</description>
                <environment></environment>
        <key id="38178">MGNLUI-2819</key>
            <summary>No trace in logs when a Vaadin internal error occurs (e.g. PaintException)</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/major.svg">Major</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="1">Fixed</resolution>
                                        <assignee username="mgeljic">Mika&#235;l Gelji&#263;</assignee>
                                    <reporter username="mgeljic">Mika&#235;l Gelji&#263;</reporter>
                        <labels>
                            <label>errorhandling</label>
                    </labels>
                <created>Wed, 23 Apr 2014 11:44:56 +0200</created>
                <updated>Thu, 8 May 2014 09:15:18 +0200</updated>
                            <resolved>Wed, 23 Apr 2014 13:46:08 +0200</resolved>
                                    <version>5.2.4</version>
                                    <fixVersion>5.2.5</fixVersion>
                    <fixVersion>5.3</fixVersion>
                                    <component>admincentral</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="83756" author="mgeljic" created="Wed, 23 Apr 2014 13:46:08 +0200"  >&lt;p&gt;Check out branch &quot;error-handling&quot;, in there you&apos;ll find an additional subapp for the sample app (commits marked as DO NOT MERGE!!!).&lt;br/&gt;
It needs to be bootstrapped and can only be opened via location e.g. &lt;a href=&quot;http://localhost:8080/magnolia-bundled-webapp/.magnolia/admincentral#app:sample:error&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://localhost:8080/magnolia-bundled-webapp/.magnolia/admincentral#app:sample:error&lt;/a&gt;;&lt;/p&gt;

&lt;p&gt;From there you can fire NPEs at two different phases:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;b&gt;Red button&lt;/b&gt;&lt;br/&gt;
fires NPE during update phase; doesn&apos;t crash the session; is handled by AdmincentralErrorHandler and sends a message to the pulse.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;Death button&lt;/b&gt;&lt;br/&gt;
fires NPE during paint phase; crashes UIDL response and current application state; results in Vaadin &apos;Internal error&apos;; as expected, simple refresh (without ?restartApplication) results in the 500 page.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="83851" author="gjoseph" created="Thu, 24 Apr 2014 18:03:03 +0200"  >&lt;p&gt;I guess we could actually merge that error sample subapp. Here&apos;s a challenge for you: write a ui test for this ? &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.magnolia-cms.com/images/icons/emoticons/tongue.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;br/&gt;
(I&apos;m concerned the behavior we change by simply removing the line in &lt;tt&gt;AdmincentralPresenter&lt;/tt&gt; isn&apos;t documented, since there&apos;s no code to leave an inline comment about, or tested, so we&apos;d accidentally re-introduce that &quot;bug&quot; at some other point). Well, perhaps a simple inline comment where we set the AdmincentralErrorHandler, or in AdmincentralErrorHandler itself, would already help (understanding the distinction between the 2 error handlers)&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10040">
                    <name>causality</name>
                                            <outwardlinks description="caused by">
                                        <issuelink>
            <issuekey id="29619">MGNLUI-1139</issuekey>
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