blocks|key|4232721|text|有两种可能性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4232722|4232723|您的源目录位置不正确(请使用sourceSets指令来解决此问题。您的源目录应该类似于src/main/java/your/package)|ordered-list-item|offset|length|style|CODE|4232724|Add，以指示主类的位置|4232725|4232726|springBoot+{+mainClass+=+"hello.FileUploader“}|4232727|我很确定它是1。|4232728|entityMap^0|0|0|17|Q|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|U|8|@$F|V|G|W|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|X|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

There are two possibilities

<ol>
<li>Your source directory is not in the right location (use the sourceSets directive to fix this. your source directory should resemble something like <code>src/main/java/your/package</code>)</li>
<li>Add this to indicate where your main class is 

<pre><code>springBoot {
 mainClass = "hello.FileUploader"
}
</code></pre></li>
</ol>

I am pretty sure it is 1.

blocks|key|5650589|text|我也有这个问题，这里我解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5650590|如果您的项目只是将在其他项目中使用的模块，请使用org.springframework.boot:spring-boot-starter而不是org.springframework.boot:spring-boot-starter-web。|offset|length|style|CODE|5650591|或者在gradle中设置主类：|5650592|mainClassName+=+'your.package.MainClass'|code-block|syntax|javascript|5650593|或仅禁用bootRepackage|5650594|bootRepackage+{
++++enabled+=+false
}|5650595|entityMap^0|0|O|18|1Z|1C|0|0|0|4|D|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

I also have this problem, Here I solved the problem:

use <code>org.springframework.boot:spring-boot-starter</code> instead of <code>org.springframework.boot:spring-boot-starter-web</code>, if your project is only an module that will be used in other project.

Or Set the main class in gradle:

<pre><code>mainClassName = 'your.package.MainClass'
</code></pre>

Or Just disable the <code>bootRepackage</code>

<pre><code>bootRepackage {
 enabled = false
}
</code></pre>

blocks|key|2121341|text|你的项目中没有main方法(否则插件会找到一个)。main方法有一个非常具体的签名，因此请检查您是否具有public+static+void+main(String[]+args)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2121342|entityMap^0|1G|12|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

There is no main method in your project (otherwise the plugin would find one). A main method has a very specific signature, so check that you have <code>public static void main(String[] args)</code>.

blocks|key|5650422|text|如果主类没有在build.gradle文件所属的当前项目中定义，但您希望出于某种目的启动它，例如sprint集成测试。如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5650423|添加|5650424|bootRepackage+{
++++mainClass+=+'your.app.package.Application'
}|code-block|syntax|javascript|5650425|在build.gradle中(在一行应用插件：'spring-boot‘之后，因为需要加载插件)来解决这个问题。|5650426|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If the main class is not defined in the current project which the build.gradle file belongs to, but you want to launch it for some purpose, like sprint integration test. Do it like this:

Adding

<pre><code>bootRepackage {
 mainClass = 'your.app.package.Application'
}
</code></pre>

in build.gradle (after the line apply plugin: 'spring-boot', because the plugin needs to be loaded) fix the problem.

blocks|key|2121432|text|我知道这是一个非常古老的帖子。但是我在尝试构建我的第一个spring-+boot应用程序(https://spring.io/guides/gs/spring-boot/#scratch)时遇到了这个问题。因此，教程中提到的pom.xml的位置是不正确的。你需要把它放在你的src文件夹之外。下面是最终的目录结构--+/workspace/src/main/java/hello/HelloController.java+/workspace/src/main/java/hello/Application.java+/workspace/pom.xml|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2121433|entityMap|0|LINK|mutability|MUTABLE|url|https://spring.io/guides/gs/spring-boot/#scratch^0|19|1C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I know this is a very old post. But I came across this issue while trying to build my first spring- boot application (<a href="https://spring.io/guides/gs/spring-boot/#scratch" rel="nofollow">https://spring.io/guides/gs/spring-boot/#scratch</a>).
So the location of the pom.xml, mentioned in the tutorial is incorrect. You need to place it outside your src folder.
So here is the final directory structure - 
 /workspace/src/main/java/hello/HelloController.java
 /workspace/src/main/java/hello/Application.java
 /workspace/pom.xml

blocks|key|2121479|text|我通过指定编码解决了这个问题。可能是因为我在IDE中编写了代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2121480|java+-Dfile.encoding=UTF-8+-jar+build+<filename>.jar|code-block|syntax|javascript|2121481|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I solved it by specifying the encoding. Probably it's because I wrote the code in an IDE.

<pre><code>java -Dfile.encoding=UTF-8 -jar build &lt;filename&gt;.jar
</code></pre>

blocks|key|4232926|text|这也发生在我身上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4232927|我被build.gradle文件的位置弄糊涂了:我认为它应该放在src/main/java/hello，中，因为它紧跟在创建这个子目录结构的指令后面。|offset|length|style|CODE|BOLD|4232928|它应该放在包含src文件夹的根文件夹中。一旦我这样做了，并从根文件夹调用"gradle+build“而不是指南中指示的"./gradlew+build”，构建就成功了。|4232929|我没有执行gradle的标准安装，只是下载了二进制文件，也许这就是"./gradlew+build“对我失败的原因。|4232930|entityMap^0|0|2|C|W|J|0|7|3|11|C|1O|F|0|Y|F|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]|$D|S|E|T|F|H]]|9|@]|A|$]]|$1|I|3|J|5|6|7|U|8|@$D|V|E|W|F|H]|$D|X|E|Y|F|G]|$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|K|3|L|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|N|$]]

This happened to me as well. 

I was confused by the location of <code>build.gradle</code> file: I thought it should be located in src/main/java/hello, because it is mentioned right after the instruction to create this sub-directory structure. 

It should be placed in the root folder containing src folder. Once I did that and called "<code>gradle build</code>" from the root folder and not "<code>./gradlew build</code>" as the guide instructs, build was successful.

I did not perform the standard installation for gradle, just downloaded the binaries, maybe this is the reason that "<code>./gradlew build</code>" failed for me.

I got a problem with my gradle build. I use the standard proposed by the Spring Website (<a href="https://spring.io/guides/gs/rest-service/" rel="noreferrer">https://spring.io/guides/gs/rest-service/</a>), but when I try to use gradle build, I got this error :

<img src="https://i.stack.imgur.com/RxULR.jpg" alt="My gradle problem">

It doesnt work for this gradle, but when I use another one (that I took when I was at school) it work perfectly.

Unable to find main class :bootRepackage

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的gradle版本出了点问题。我使用了Spring网站()提出的标准，但是当我尝试使用gradle build时，我得到了这个错误：​​它不适用于这个gradle，但当我使用另一个(我在学校时使用的)时，它工作得很好。

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