https://blog.margrop.net/tag/java/ Recent content in Java on 魔都水滴 Hugo -- gohugo.io zh-CN Wed, 01 May 2024 13:34:09 +0800 https://blog.margrop.net/post/activate-jetbrains-intellij-idea/ Wed, 01 May 2024 13:34:09 +0800 https://blog.margrop.net/post/activate-jetbrains-intellij-idea/ <h1 id="请自行通过下面搜索引擎和关键字进行搜索">请自行通过下面搜索引擎和关键字进行搜索</h1> <h2 id="fofahttpsenfofainfo"><a href="https://en.fofa.info/">Fofa</a></h2> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-yaml" data-lang="yaml"><span style="display:flex;"><span><span style="color:#ae81ff">header=&#34;https://account.jetbrains.com/fls-auth&#34;</span> </span></span></code></pre></div><h2 id="shodanhttpswwwshodanio"><a href="https://www.shodan.io/">Shodan</a></h2> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-yaml" data-lang="yaml"><span style="display:flex;"><span><span style="color:#f92672">Location</span>: <span style="color:#ae81ff">https://account.jetbrains.com/fls-auth</span> </span></span></code></pre></div><h2 id="censyshttpscensyscom"><a href="https://censys.com/">Censys</a></h2> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-yaml" data-lang="yaml"><span style="display:flex;"><span><span style="color:#f92672">services.http.response.headers.location</span>: <span style="color:#ae81ff">account.jetbrains.com/fls-auth</span> </span></span></code></pre></div> https://blog.margrop.net/post/fix-spring2-allowed-origins-error/ Sun, 12 Mar 2023 20:20:01 +0800 https://blog.margrop.net/post/fix-spring2-allowed-origins-error/ <h1 id="异常提示">异常提示：</h1> <pre tabindex="0"><code>When allowCredentials is true, allowedOrigins cannot contain the special value &#34;*&#34; since that cannot be set on the &#34;Access-Control-Allow-Origin&#34; response header. To allow credentials to a set of origins, list them explicitly or consider using &#34;allowedOriginPatterns&#34; instead. </code></pre><p>#解决办法： 跨域配置报错，将<code>.allowedOrigins</code>替换成<code>.allowedOriginPatterns</code>即可。</p> https://blog.margrop.net/post/fix-springfox-documentation-plugins-bootstrapper-npe/ Sun, 12 Mar 2023 17:56:57 +0800 https://blog.margrop.net/post/fix-springfox-documentation-plugins-bootstrapper-npe/ <h1 id="异常提示">异常提示：</h1> <pre tabindex="0"><code>Failed to start bean &#39;documentationPluginsBootstrapper&#39;; nested exception is java.lang.NullPointerException </code></pre><h1 id="原因分析">原因分析：</h1> <p><code>SpringFox</code> 3.0.0 不兼容 <code>SpringBoot</code> 2.6.4</p> <h1 id="解决方案">解决方案：</h1> <ul> <li>参考链接 <a href="https://stackoverflow.com/questions/40241843/failed-to-start-bean-documentationpluginsbootstrapper-in-spring-data-rest">https://stackoverflow.com/questions/40241843/failed-to-start-bean-documentationpluginsbootstrapper-in-spring-data-rest</a> <a href="https://github.com/springfox/springfox/issues/3462#issuecomment-1010721223">https://github.com/springfox/springfox/issues/3462#issuecomment-1010721223</a></li> </ul> https://blog.margrop.net/post/java-spring-boot-jni-java-native-interface-library-loader/ Sat, 27 Mar 2021 16:37:31 +0800 https://blog.margrop.net/post/java-spring-boot-jni-java-native-interface-library-loader/ <p>由于Java跨平台需要，自行写了一个跨平台的 JNI 本地方法库加载器。</p> <h1 id="简单实现逻辑">简单实现逻辑</h1> <ol> <li>根据环境变量<code>os.name</code>，判断当前系统属于<code>Windows</code>,<code>Linux</code>还是<code>MacOS</code></li> <li>如果是<code>Linux</code>，继续判断是<code>CentOS</code>还是<code>Debian</code></li> <li>读取 jar 包中的库文件</li> <li>根据文件名后缀<code>dll</code>、<code>so</code>、<code>jnilib</code>和<code>dylib</code>，过滤符合当前平台的库文件</li> <li>将当前平台的库文件复制到系统临时目录<code>java.io.tmpdir</code></li> <li>使用<code>System.load</code>加载库文件</li> </ol> https://blog.margrop.net/post/spring-boot-undertow-upload-file-not-found-temp-folder/ Sat, 27 Mar 2021 11:17:26 +0800 https://blog.margrop.net/post/spring-boot-undertow-upload-file-not-found-temp-folder/ <h1 id="问题出现">问题出现</h1> <p>前2天，公司的 SpringBoot 项目突然出现了，无法上传 Excel 文件的问题。</p> <p>经过查看 Java 日志，发现出现了大量的异常：<code>java.nio.file.NoSuchFileException: /tmp/undertow.12020.9432679758080410942/undertow17157208698492118168upload</code></p> https://blog.margrop.net/post/mysql-exception-hour-of-day-0-1-solution/ Thu, 25 Mar 2021 10:53:15 +0800 https://blog.margrop.net/post/mysql-exception-hour-of-day-0-1-solution/ <h1 id="做用户导出的功能代码报错hour_of_day-0---1">做用户导出的功能，代码报错HOUR_OF_DAY: 0 -&gt; 1</h1> <ul> <li>Exception in thread &ldquo;main&rdquo; java.lang.IllegalArgumentException: HOUR_OF_DAY: 0 -&gt; 1 详细报错内容如下：</li> </ul> https://blog.margrop.net/post/springboot-devtools-terrible/ Wed, 03 Mar 2021 18:23:39 +0800 https://blog.margrop.net/post/springboot-devtools-terrible/ <p>最近在SpringBoot的项目中新增了不少改动，然后就碰到了一个非常奇怪的问题。</p> <h1 id="hibernate数据库查询报错"><code>Hibernate</code>数据库查询报错</h1> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-java" data-lang="java"><span style="display:flex;"><span>2021<span style="color:#f92672">-</span>03<span style="color:#f92672">-</span>03 17:08:28.<span style="color:#a6e22e">016</span> ERROR 36216 <span style="color:#f92672">---</span> <span style="color:#f92672">[</span> XNIO<span style="color:#f92672">-</span>2 task<span style="color:#f92672">-</span>1<span style="color:#f92672">]</span> o.<span style="color:#a6e22e">h</span>.<span style="color:#a6e22e">p</span>.<span style="color:#a6e22e">access</span>.<span style="color:#a6e22e">spi</span>.<span style="color:#a6e22e">SetterMethodImpl</span> : HHH000123: IllegalArgumentException in <span style="color:#66d9ef">class</span><span style="color:#960050;background-color:#1e0010">:</span> <span style="color:#a6e22e">net</span>.<span style="color:#a6e22e">margrop</span>.<span style="color:#a6e22e">racentity</span>.<span style="color:#a6e22e">entity</span>.<span style="color:#a6e22e">Race</span>, setter method of property: raceType </span></span><span style="display:flex;"><span>2021<span style="color:#f92672">-</span>03<span style="color:#f92672">-</span>03 17:08:28.<span style="color:#a6e22e">016</span> ERROR 36216 <span style="color:#f92672">---</span> <span style="color:#f92672">[</span> XNIO<span style="color:#f92672">-</span>2 task<span style="color:#f92672">-</span>1<span style="color:#f92672">]</span> o.<span style="color:#a6e22e">h</span>.<span style="color:#a6e22e">p</span>.<span style="color:#a6e22e">access</span>.<span style="color:#a6e22e">spi</span>.<span style="color:#a6e22e">SetterMethodImpl</span> : HHH000091: Expected type: net.<span style="color:#a6e22e">margrop</span>.<span style="color:#a6e22e">raceapi</span>.<span style="color:#a6e22e">entity</span>.<span style="color:#a6e22e">permanent</span>.<span style="color:#a6e22e">RaceType</span>, actual value: net.<span style="color:#a6e22e">margrop</span>.<span style="color:#a6e22e">raceapi</span>.<span style="color:#a6e22e">entity</span>.<span style="color:#a6e22e">permanent</span>.<span style="color:#a6e22e">RaceType</span> </span></span></code></pre></div><p>这简直就是奇了怪了 <code>Expected type</code>和<code>actual value</code>完全是一模一样，可<code>Hibernate</code>认为不一样，这可咋整。</p> https://blog.margrop.net/post/how-to-map-json-collections-using-jpa-and-hibernate/ Fri, 29 Jan 2021 16:06:09 +0800 https://blog.margrop.net/post/how-to-map-json-collections-using-jpa-and-hibernate/ <h1 id="介绍">介绍</h1> <p>在本文中，我们将看到如何使用<a href="http://www.google.com/" title="Hibernate Types">Hibernate Types</a>开源项目将JSON列映射到JPA实体属性。</p> <p>虽然您可以创建自己的自定义Hibernate类型，但可以在Oracle，SQL Server，PostgreSQL或MySQL上映射JSON列类型，但是由于<a href="http://www.google.com/" title="Hibernate Types">Hibernate Types</a>项目已经提供了此功能，因此您无需实现自己的Hibernate Type 。</p> https://blog.margrop.net/post/java-springfox-number-format-exception/ Mon, 18 Jan 2021 16:39:34 +0800 https://blog.margrop.net/post/java-springfox-number-format-exception/ <p>最近升级了SpringFox至3.0.0版本，访问接口文档，出现了一堆异常</p> <p><code>Illegal DefaultValue null for parameter type integer</code> <code>java.lang.NumberFormatException: For input string: &quot;&quot;</code></p> https://blog.margrop.net/post/spring-aop-annotation-and-within/ Thu, 14 Jan 2021 15:29:41 +0800 https://blog.margrop.net/post/spring-aop-annotation-and-within/ <p>AOP中扫描指定注解相关说明 （1）@annotation：用来拦截所有被某个注解修饰的方法 （2）@within：用来拦截所有被某个注解修饰的类 （3）within：用来指定扫描的包的范围</p>