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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-1911] java.lang.IllegalStateException: No GridFS instance defined! </title>
                <link>https://jira.mongodb.org/browse/JAVA-1911</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;GridFS is failing to write the file. After creating a GridFS class and storing few files to mongodb. I am trying to read it back.&lt;/p&gt;

&lt;p&gt;DBCursor cursor = fs.getFileList();&lt;br/&gt;
		int count=0;&lt;br/&gt;
		while(cursor.hasNext()){&lt;/p&gt;

&lt;p&gt;			GridFSDBFile object = (GridFSDBFile)cursor.next();&lt;br/&gt;
			final InputStream  is = object.getInputStream();&lt;br/&gt;
			System.out.println(&quot;is to &quot;+is.toString());&lt;br/&gt;
			try &lt;/p&gt;
{
				//destination = Paths.get(&quot;C:\\drls\\test&quot;+count+&quot;.drl&quot;);
				//Files.copy(is, destination);
				object.writeTo(&quot;C:\\drls\\test&quot;+count+&quot;.drl&quot;);
			}
&lt;p&gt; catch (IOException e) &lt;/p&gt;
{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
&lt;p&gt;			count++;&lt;br/&gt;
		}&lt;/p&gt;</description>
                <environment>Windows 7 64 bit</environment>
        <key id="223764">JAVA-1911</key>
            <summary>java.lang.IllegalStateException: No GridFS instance defined! </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="ross@mongodb.com">Ross Lawley</assignee>
                                    <reporter username="PavanKua">Pavan [X]</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Aug 2015 05:28:56 +0000</created>
                <updated>Sun, 27 Nov 2016 03:15:48 +0000</updated>
                            <resolved>Fri, 7 Aug 2015 08:12:30 +0000</resolved>
                                    <version>3.0.3</version>
                                                    <component>GridFS</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="999172" author="ross@10gen.com" created="Fri, 7 Aug 2015 08:12:30 +0000"  >&lt;p&gt;Marking as &quot;Won&apos;t Fix&quot; as there are no plans to change the existing &lt;tt&gt;com.mongodb.gridfs&lt;/tt&gt; version of GridFS.&lt;/p&gt;

&lt;p&gt;However, there are improvements are being made to the forthcoming &lt;tt&gt;com.mongodb.client.gridfs&lt;/tt&gt; that will meet the new GridFS specification.&lt;/p&gt;</comment>
                            <comment id="999169" author="ross@10gen.com" created="Fri, 7 Aug 2015 08:10:12 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=PavanKua&quot; class=&quot;user-hover&quot; rel=&quot;PavanKua&quot;&gt;PavanKua&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The reason for the error is due to the casting of a &lt;tt&gt;DBObject&lt;/tt&gt; into a &lt;tt&gt;GridFSDBFile&lt;/tt&gt;, this fails because the &lt;tt&gt;DBObject&lt;/tt&gt; doesn&apos;t have access to the &lt;tt&gt;GridFS&lt;/tt&gt; instance.&lt;/p&gt;

&lt;p&gt;There are two possible approaches:&lt;/p&gt;

&lt;p&gt;1. Use &lt;tt&gt;fs.find(new DBObject())&lt;/tt&gt; to return a &lt;tt&gt;List&amp;lt;GridFSDBFile&amp;gt;&lt;/tt&gt; and then iterate through.  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;List&amp;lt;GridFSDBFile&amp;gt; files = gridFS.find(new BasicDBObject());&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;for (GridFSDBFile file : files) {&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;    file.writeTo(&quot;/tmp/&quot; + file.getFilename());&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;   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;}&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;2. Inside the while loop call the &lt;tt&gt;gridFS.findOne&lt;/tt&gt; method for each file 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;while(cursor.hasNext()) {&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;    GridFSDBFile file = gridFS.findOne(cursor.next());&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;    file.writeTo(&quot;/tmp/&quot; + file.getFilename());&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;   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;}&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;Unfortunately, there are downsides to both, the size in memory for 1. versus the number of queries in 2.  &lt;br/&gt;
This deficiency is being addressed in the new version of GridFS coming in the upcoming 3.1 version of the driver.&lt;/p&gt;

&lt;p&gt;Ross&lt;/p&gt;</comment>
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