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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[JAVA-4303] Improve map/flatmap of Publisher[Void]</title>
                <link>https://jira.mongodb.org/browse/JAVA-4303</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;In 5.0.0 for the Scala driver use &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;&lt;/tt&gt; instead of &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt; to allow for composable Observables.&lt;/p&gt;

&lt;p&gt;-------&lt;/p&gt;

&lt;p&gt;Was: &lt;/p&gt;

&lt;p&gt;mongo-scala-driver: 4.3.1&lt;/p&gt;

&lt;p&gt;The implementation of &lt;tt&gt;MapObservable&lt;/tt&gt; and &lt;tt&gt;FlatMapObservable&lt;/tt&gt; in the scala driver can lead to unexpected results with `&lt;tt&gt;Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt;`.&lt;/p&gt;

&lt;p&gt;Since Void is not instantiable, the impact on the monadic functions can be missed and lead to bugs. i.e. map/flatmap called on a `Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;` will never be invoked.&lt;/p&gt;

&lt;p&gt;This may lead to bugs in clients which are not aware of this. For example&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;val obs: Observable[List] = &lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; for {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160; _ &amp;lt;- session.commitTransaction() // Publisher[Void]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160; _ = println(&quot;Transaction committed&quot;) // never seen&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; } yield List(1, 2, 3) // never reached&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;will result in an empty List.&lt;/p&gt;

&lt;p&gt;while we can work around this by wrapping every Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt; with our `completeWith(obs, ()): Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;`&lt;br/&gt;
 where&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;def completeWith[A](obs: Observable[Void], f: =&amp;gt; A): Observable[A] =&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160; new Observable[A] {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160; override def subscribe(observer: Observer[_ &amp;gt;: A]): Unit =&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160; obs.subscribe(&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; new Observer[Void] {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; override def onError(throwable: Throwable): Unit =&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; observer.onError(throwable)&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; override def onSubscribe(subscription: Subscription): Unit =&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; observer.onSubscribe(subscription)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; override def onComplete(): Unit = {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; observer.onNext(f)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; observer.onComplete()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; }&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; override def onNext(tResult: Void): Unit =&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;It would seem safer for clients if the MapObservable/FlatMapObservables threw exceptions if onComplete was called without calling onNext.&lt;/p&gt;

&lt;p&gt;An alternative may be to replace occurences of `&lt;tt&gt;Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt;` with `&lt;tt&gt;Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;&lt;/tt&gt;` so that clients can use map/flatMap to react to completion (rather than being forced to wrap or use the reactive API (e.g. `&lt;tt&gt;obs.subscribe&lt;/tt&gt;` )&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1875996">JAVA-4303</key>
            <summary>Improve map/flatmap of Publisher[Void]</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="valentin.kovalenko@mongodb.com">Valentin Kavalenka</assignee>
                                    <reporter username="colin.fairless@digital.hmrc.gov.uk">Colin Fairless</reporter>
                        <labels>
                            <label>external-user</label>
                    </labels>
                <created>Thu, 16 Sep 2021 11:30:12 +0000</created>
                <updated>Fri, 5 Jan 2024 19:57:14 +0000</updated>
                            <resolved>Fri, 5 Jan 2024 19:06:24 +0000</resolved>
                                                    <fixVersion>5.0.0</fixVersion>
                                    <component>Reactive Streams</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5989714" author="xgen-internal-githook" created="Fri, 5 Jan 2024 18:53:44 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Valentin Kovalenko&apos;, &apos;email&apos;: &apos;valentin.kovalenko@mongodb.com&apos;, &apos;username&apos;: &apos;stIncMale&apos;}
&lt;p&gt;Message: Expose `Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;` instead of `Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;` (#1282)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4303&quot; title=&quot;Improve map/flatmap of Publisher[Void]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4303&quot;&gt;&lt;del&gt;JAVA-4303&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/e78a2dcf73b6eec2c77fe647899c8d29a46e5216&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/e78a2dcf73b6eec2c77fe647899c8d29a46e5216&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4118268" author="ross@10gen.com" created="Tue, 12 Oct 2021 12:01:08 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=colin.fairless%40digital.hmrc.gov.uk&quot; class=&quot;user-hover&quot; rel=&quot;colin.fairless@digital.hmrc.gov.uk&quot;&gt;colin.fairless@digital.hmrc.gov.uk&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Marked this for 5.0.0 and added &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4345&quot; title=&quot;Add .completeWithUnit helper for Observables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4345&quot;&gt;&lt;del&gt;JAVA-4345&lt;/del&gt;&lt;/a&gt; for the next minor release.&lt;/p&gt;

&lt;p&gt;Ross&lt;/p&gt;</comment>
                            <comment id="4118219" author="colin.fairless@digital.hmrc.gov.uk" created="Tue, 12 Oct 2021 11:53:17 +0000"  >&lt;p&gt;Hi Ross,&lt;/p&gt;

&lt;p&gt;I&apos;m glad this will be considered for the 5.0.0 major release.&lt;/p&gt;

&lt;p&gt;I think an &lt;tt&gt;observable.toUnit&lt;/tt&gt; (or &lt;tt&gt;.completeWithUnit&lt;/tt&gt;) helper could be useful in the meantime. Thanks.&lt;/p&gt;</comment>
                            <comment id="4116070" author="ross@10gen.com" created="Mon, 11 Oct 2021 15:48:47 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=colin.fairless%40digital.hmrc.gov.uk&quot; class=&quot;user-hover&quot; rel=&quot;colin.fairless@digital.hmrc.gov.uk&quot;&gt;colin.fairless@digital.hmrc.gov.uk&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I agree and think with hindsight the &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;&lt;/tt&gt; api makes more sense.  That said without introducing a breaking change I&apos;m unsure how best to solve this before the next major release (5.0) which may be some time out.&lt;/p&gt;

&lt;p&gt;Would a &lt;tt&gt;Observable.toUnit&lt;/tt&gt; helper be of any use? I tried to see if I could implicitly handle &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt; in the composable helper but was unable to find a quick solution.&lt;/p&gt;

&lt;p&gt;Ross&lt;/p&gt;</comment>
                            <comment id="4089749" author="colin.fairless@digital.hmrc.gov.uk" created="Tue, 28 Sep 2021 16:39:22 +0000"  >&lt;p&gt;Hi Ross Lawley,&lt;/p&gt;

&lt;p&gt;Thanks for looking at this.&lt;/p&gt;

&lt;p&gt;I think that the functions being called which return &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt; (e.g. `&lt;tt&gt;commitTransaction&lt;/tt&gt;`) are being called for their side-effects, not for short-circuiting behaviour, and the short-circuiting is surprising if not looking closely at the type. It currently requires wrapping with a custom &lt;tt&gt;completeWith&lt;/tt&gt; function in order to compose with other Observables (with map/flatMap). I think using &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;&lt;/tt&gt; instead would be more intuitive, and lead to less bugs.&lt;font color=&quot;#000000&quot;&gt;&lt;/font&gt;&lt;/p&gt;</comment>
                            <comment id="4088894" author="ross@10gen.com" created="Tue, 28 Sep 2021 12:44:35 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=colin.fairless%40digital.hmrc.gov.uk&quot; class=&quot;user-hover&quot; rel=&quot;colin.fairless@digital.hmrc.gov.uk&quot;&gt;colin.fairless@digital.hmrc.gov.uk&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;This is a tricky one, an &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;&lt;/tt&gt; is essentially an empty &lt;tt&gt;Observable&lt;/tt&gt; and an &lt;tt&gt;Observable&lt;/tt&gt; can be thought of as an asynchronous sequence.&lt;/p&gt;

&lt;p&gt;Take the following code:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    val syncSequences = for {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      _ &amp;lt;- Seq(3, 2, 1)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      _ &amp;lt;- Seq()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      x &amp;lt;- Seq(1, 2, 3)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    } yield x&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    println(s&quot;syncSequences:  $syncSequences&quot;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;outputs: syncSequences:  List()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The argument can be made that the async observable with an empty observable acts as expected. eg:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    val resultObservable: Observable[_] = for {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      _ &amp;lt;- obsInteger&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      _ &amp;lt;- obsVoid&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      y &amp;lt;- obsInteger&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    } yield y&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    resultObservable.subscribe(x =&amp;gt; println(s&quot;onNext: -&amp;gt; $x&quot;), e =&amp;gt; println(s&quot;Error: $e&quot;), () =&amp;gt; println(&quot;Complete&quot;))&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;outputs: Complete&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;However, I can also see that having an &lt;tt&gt;Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;&lt;/tt&gt; signature would be more user friendly and could be proposed for the next major version of the driver: 5.0.0 &lt;/p&gt;</comment>
                            <comment id="4082685" author="ross@10gen.com" created="Fri, 24 Sep 2021 10:30:23 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=colin.fairless%40digital.hmrc.gov.uk&quot; class=&quot;user-hover&quot; rel=&quot;colin.fairless@digital.hmrc.gov.uk&quot;&gt;colin.fairless@digital.hmrc.gov.uk&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the ticket. I&apos;m investigating the best path forward here.&lt;/p&gt;

&lt;p&gt;Just to note:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;It would seem safer for clients if the MapObservable/FlatMapObservables threw exceptions if onComplete was called without calling onNext.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;&#160;&lt;br/&gt;
Would be against the reactive streams specification. So will have to look for an alternative approach.&lt;/p&gt;</comment>
                            <comment id="4065333" author="colin.fairless@digital.hmrc.gov.uk" created="Thu, 16 Sep 2021 11:39:10 +0000"  >&lt;p&gt;I can&apos;t edit the ticket to escape the { in the code examples. (it&apos;s added in &quot;Unknown macro: &quot;).. Hope they are still intelligible.&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>&lt;p&gt;There are multiple changes that break compile-time compatibility (the source code will likely have to be changed to work the the upgraded driver version). Let&apos;s mention them in What&apos;s new:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;`org.reactivestreams.Publisher&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;` is no longer automatically convertible to `org.mongodb.scala.SingleObservable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;`, because we removed the `org.mongodb.scala.ObservableImplicits.ToSingleObservableVoid` implicit class.&lt;/li&gt;
	&lt;li&gt;Our API no longer exposes `org.mongodb.scala.Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Void&amp;#93;&lt;/span&gt;`. Instead, it exposes `org.mongodb.scala.Observable&lt;span class=&quot;error&quot;&gt;&amp;#91;Unit&amp;#93;&lt;/span&gt;`. The documentation of the `Observable` trait explains the difference.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There is also a non-breaking change that we should mention in What&apos;s new: we deprecated the method `org.mongodb.scala.Observable.completeWithUnit`, and plan to remove it in a major release.&lt;/p&gt;</customfieldvalue>

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