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Building High-Performance JavaScript APIs with Node.js and Integrating with Existing Java Systems

The core of Node.js's high-performance JavaScript API is its non-blocking I/O and event-driven architecture, suitable for lightweight, high-concurrency backend services. 1.Node.js' asynchronous model makes it perform well when handling a large number of concurrent requests, especially suitable for RESTful or GraphQL interfaces, and can be quickly developed through frameworks such as Express and Koa; 2. Common methods of integrating with Java systems include HTTP interface calls, message queues, shared databases and RPC protocols, among which HTTP calls are the simplest but require timeouts and retry processing; 3. Performance optimization includes the rational use of cache, database connection pools, streaming, cluster mode and monitoring logs to improve system efficiency and reduce back-end pressure

Jul 23, 2025 am 02:40 AM

Securing Java Applications against OWASP Top 10

Preventinjectionbyusingparameterizedqueries,querybuilders,andinputvalidation;2.SecureauthenticationwithSpringSecurityorApacheShiro,enforcestrongpasswords,MFA,andsecuresessioncookies;3.Protectsensitivedataviabcrypt/PBKDF2forpasswords,AES-256-GCMencryp

Jul 23, 2025 am 02:18 AM

Java安全

How to set up Apache as a reverse proxy for a Node.js or Tomcat application?

Apache can effectively handle Node.js or Tomcat application requests as a reverse proxy server. 1. First enable mod_proxy, mod_proxy_http and mod_ssl modules and restart the service; 2. Configure the virtual host to forward the request to the Node.js application running on port 3000; 3. For Tomcat applications, configure the ProxyPass and ProxyPassReverse rules to point to port 8080; 4. Optionally add SSL support, configure the certificate path and open the firewall rules. After all steps are completed, make sure to check logs for common problems such as permissions or path errors.

Jul 23, 2025 am 01:51 AM

apache反向代理

Understanding Java Class Loader Leakage

The main reasons for the Java class loader leak are that the thread context class loader is not reset, the static variable holds the class loader or class instance, the listener and callback are not logged out, and the JDBC driver registration is not cleared. 1. The thread context class loader has not been restored after use, so it should be set and restored manually; 2. Static variables hold the class loader or the classes it loads for a long time, so it cannot be recycled. It is recommended to replace strong references with weak references; 3. The listener and callback are not logged out, which will cause the class loader to be unable to be released, and it should be explicitly unregistered when closed; 4. The JDBC driver is not removed from DriverManager, which will also cause leakage, and should be actively cleaned before the application is closed. Such problems can be effectively prevented through code specifications, resource management and memory analysis tools.

Jul 22, 2025 am 03:57 AM

Java

Understanding Java Class Loading Mechanism

The Java class loading mechanism is the core of the runtime, and understanding it helps to troubleshoot class conflicts, class failure, and other problems. Its basic process is divided into three stages: loading, linking (verification, preparation, parsing) and initialization, and is loaded on demand using LazyLoading. Class loaders include BootstrapClassLoader, ExtensionClassLoader, ApplicationClassLoader and custom class loaders, and use the parent delegation model to ensure uniqueness and security. Frequently asked questions include ClassNotFoundException, NoClassDefFoundError, class duplicate loading, resource leakage, etc. Use suggestions include checking

Jul 19, 2025 am 03:52 AM

How to configure Nginx as a reverse proxy for a Node.js/Python/Tomcat application?

How to configure Nginx as a reverse proxy for Node.js, Python and Tomcat applications? 1. Edit Nginx core configuration file (such as /etc/nginx/sites-available/default), create server blocks and set listening ports and domain names; 2. Use proxy_pass in location/ to point to the corresponding backend service address, such as Node.js to use http://localhost:3000, Tomcat to use http://localhost:8080, Python can connect to Gunicorn through UnixSocket; 3. Add necessary request header pass

Jul 19, 2025 am 02:53 AM

配置

Java Security Vulnerabilities and Mitigation Strategies

Common security vulnerabilities in Java applications mainly include deserialization vulnerabilities, third-party library vulnerabilities, configuration and permission issues, and improper encryption processing. 1. Deserialization vulnerabilities can be mitigated by avoiding untrusted source input, using ObjectInputFilter or alternatives; 2. Third-party library vulnerabilities require regular scanning of dependencies, integrated CI/CD checking and timely upgrade; 3. Unsecure configurations should disable debug output, restrict file uploads, run applications with minimal permissions, and reasonably configure JVM policies; 4. Encryption problems should adopt strong algorithms, use key management services, force HTTPS, and improve security with frameworks such as SpringSecurity.

Jul 18, 2025 am 03:21 AM

Java安全漏洞

Java Security Auditing and Penetration Testing

Security audit and penetration testing of Java applications need to focus on code auditing, configuration inspection, penetration testing practice and third-party component management. 1. Code auditing should identify deserialization vulnerabilities, SQL injection, command injection, improper file operation and lack of permission control, use tool assistance and manually review key points; 2. Configuration inspection should focus on SpringBootActuator endpoint, Tomcat settings, Hibernate/JPA configuration and JWT signature algorithm to ensure the principle of minimum permissions; 3. Penetration testing should simulate the attack process and verify the exploitability of vulnerabilities, such as constructing deserialization payload, modifying tokens to exceed permission access, uploading malicious files, etc.; 4. Third-party component management should scan the dependency library regularly,

Jul 18, 2025 am 12:21 AM

Java Security Best Practices for Data Protection

Protecting data security requires multi-layer protection, 1. Use HTTPS to encrypt communication and disable unsafe configurations; 2. Use strong hashing algorithm to store passwords, use char[] to save sensitive data and avoid hard coding; 3. Regularly scan for dependency vulnerabilities, reduce unnecessary dependencies, and combine them with CI process automation inspections; 4. Enable security manager and cooperate with policy files for permission control. These measures can effectively improve the security of Java applications.

Jul 17, 2025 am 03:41 AM

数据保护Java安全

Java Security Policies and Access Control

Java security policy files are configuration files that define code permissions, and specify the operations that code can execute through grant rules; enabling security managers requires starting parameters or code settings; permission allocation should follow the principle of minimum permissions; in actual deployment, pay attention to paths, granularity, version differences and third-party library permission requirements. For example: grantcodeBase"file:/myapp/-"{permissionjava.io.FilePermission"/tmp/myapp/*","read,write";}; Enable methods include -Djava.security

Jul 16, 2025 am 01:28 AM

Understanding Java Classloader Hierarchy

The core of the Java class loading mechanism is the hierarchy of the class loader and the parent delegation model. 1. BootstrapClassLoader is responsible for loading JVM core classes; 2. ExtensionClassLoader loads Java extension class library; 3. ApplicationClassLoader loads classes on the application classpath. Class loading follows the parent delegation model, that is, class loading requests will be delegated to the parent class loader first, and subclasses will only attempt to load when the parent class cannot be loaded, so as to avoid duplicate loading of classes and ensure security. Custom class loaders can be used in hot deployment, modular loading and other scenarios. They usually inherit ClassLoader and rewrite findClass()

Jul 16, 2025 am 12:50 AM

How to fix java.lang.OutOfMemoryError: Metaspace?

The root cause of the java.lang.OutOfMemoryError: The Metaspace error is that the Metaspace area of the JVM is insufficient memory, which is usually due to loading a large number of classes, such as microservice frameworks, dynamic proxying and other scenarios. 1. Metaspace memory limit can be adjusted through -XX:MaxMetaspaceSize and -XX:MetaspaceSize; 2. Check for class loading leakage to avoid high-frequency generation of new classes and troubleshoot ClassLoader usage problems; 3. If Compressedclassspace overflow, you can increase the pressure by -XX:CompressedClassSpaceSize.

Jul 11, 2025 am 03:06 AM

Install Guacamole for Remote Linux/Windows Access in Ubuntu

As a system administrator, you may find yourself (today or in the future) working in an environment where Windows and Linux coexist. It is no secret that some big companies prefer (or have to) run some of their production services in Windows boxes an

Jul 08, 2025 am 09:58 AM

Deploying Java Applications to Cloud Platforms

When deploying Java applications to cloud platforms, you need to pay attention to the following key points: 1. Prepare WAR or JAR format packaging files to avoid including local configurations; 2. Choose a suitable cloud platform and deployment method, such as PaaS, IaaS or container services; 3. Use environment variables to manage external dependency configurations to avoid hard coding; 4. Pay attention to time zone settings and log monitoring to ensure stable operation of the application.

Jul 07, 2025 am 02:29 AM

Java云平台