fix: resolve Druid monitoring page 404 after Spring Boot 3 upgrade (#239)

* Initial plan

* fix: resolve Druid monitoring page 404 by manually registering StatViewServlet and WebStatFilter

Move auto-configuration exclusions from conditional GenAutoConfig to
@SpringBootApplication to ensure they are always applied reliably.
Add DruidMonitorConfig to manually register the Jakarta-based
StatViewServlet and WebStatFilter when gen.isdb=true, bypassing
the excluded DruidDataSourceAutoConfigure.
Fix RemoveDruidAdConfig by removing @AutoConfigureAfter and
@ConditionalOnBean which don't work for non-auto-configuration classes.

Co-authored-by: unknowIfGuestInDream <57802425+unknowIfGuestInDream@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: unknowIfGuestInDream <57802425+unknowIfGuestInDream@users.noreply.github.com>

Author: Copilot

src/main/java/com/tlcsdm/gen/GenApplication.java

@@ -1,10 +1,12 @@
 package com.tlcsdm.gen;
 
+import com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 
-@SpringBootApplication
+@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class, DruidDataSourceAutoConfigure.class })
 @Slf4j
 public class GenApplication {
 

src/main/java/com/tlcsdm/gen/config/DruidMonitorConfig.java

@@ -0,0 +1,65 @@
+package com.tlcsdm.gen.config;
+
+import com.alibaba.druid.spring.boot3.autoconfigure.properties.DruidStatProperties;
+import com.alibaba.druid.support.jakarta.StatViewServlet;
+import com.alibaba.druid.support.jakarta.WebStatFilter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.boot.web.servlet.ServletRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * druid监控配置
+ *
+ * @author: TangLiang
+ * @date: 2021/6/18 23:18
+ * @since: 1.0
+ */
+@Configuration
+@ConditionalOnWebApplication
+@ConditionalOnProperty(name = { "spring.datasource.druid.stat-view-servlet.enabled", "gen.isdb" }, havingValue = "true")
+@EnableConfigurationProperties(DruidStatProperties.class)
+public class DruidMonitorConfig {
+
+	@Bean
+	public ServletRegistrationBean<StatViewServlet> statViewServletRegistrationBean(DruidStatProperties properties) {
+		DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
+		ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>();
+		bean.setServlet(new StatViewServlet());
+		String urlPattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
+		bean.addUrlMappings(urlPattern);
+		if (config.getAllow() != null) {
+			bean.addInitParameter("allow", config.getAllow());
+		}
+		if (config.getDeny() != null) {
+			bean.addInitParameter("deny", config.getDeny());
+		}
+		if (config.getLoginUsername() != null) {
+			bean.addInitParameter("loginUsername", config.getLoginUsername());
+		}
+		if (config.getLoginPassword() != null) {
+			bean.addInitParameter("loginPassword", config.getLoginPassword());
+		}
+		if (config.getResetEnable() != null) {
+			bean.addInitParameter("resetEnable", config.getResetEnable());
+		}
+		return bean;
+	}
+
+	@Bean
+	public FilterRegistrationBean<WebStatFilter> webStatFilterRegistrationBean(DruidStatProperties properties) {
+		DruidStatProperties.WebStatFilter config = properties.getWebStatFilter();
+		FilterRegistrationBean<WebStatFilter> bean = new FilterRegistrationBean<>();
+		bean.setFilter(new WebStatFilter());
+		String urlPattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/*";
+		bean.addUrlPatterns(urlPattern);
+		if (config.getExclusions() != null) {
+			bean.addInitParameter("exclusions", config.getExclusions());
+		}
+		return bean;
+	}
+
+}

src/main/java/com/tlcsdm/gen/config/GenAutoConfig.java

@@ -1,12 +1,10 @@
 package com.tlcsdm.gen.config;
 
-import com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure;
 import com.alibaba.druid.spring.boot3.autoconfigure.properties.DruidStatProperties;
 import com.alibaba.druid.util.Utils;
-import org.springframework.boot.autoconfigure.AutoConfigureAfter;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -23,16 +21,14 @@
  */
 @Configuration
 @ConditionalOnWebApplication
-@AutoConfigureAfter(DruidDataSourceAutoConfigure.class)
-@ConditionalOnProperty(name = { "spring.datasource.druid.stat-view-servlet.enabled", "gen.isdb" }, havingValue = "true",
-		matchIfMissing = true)
+@ConditionalOnProperty(name = { "spring.datasource.druid.stat-view-servlet.enabled", "gen.isdb" }, havingValue = "true")
+@EnableConfigurationProperties(DruidStatProperties.class)
 public class RemoveDruidAdConfig {
 
 	/**
 	 * 方法名: removeDruidAdFilterRegistrationBean 方法描述: 除去页面底部的广告
 	 * @return org.springframework.boot.web.servlet.FilterRegistrationBean
 	 */
-	@ConditionalOnBean(DruidStatProperties.class)
 	@Bean
 	public FilterRegistrationBean removeDruidAdFilterRegistrationBean(DruidStatProperties properties) {
 		// 获取web监控页面的参数