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•Created by <Tim> on 10/20/2024 in #java-help

Deploying Spring Boot application with Stomp over WSS using nginx

Does anyone have experience with Secure Websockets (WSS) over Nginx? I currently have this nginx config file, but the websockets stopped working once I switched from unsecure http:// and ws:// to https:// and wss:// (the https:// traffic and the rest of the application works fine though, just the websocket connection fails to establish)

server {
    server_name 132.231.1.166;
    server_name sojourner-under-sabotage.se2.fim.uni-passau.de;

    location /websocket {
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header HOST $host;
        proxy_set_header X_Forwarded_For $remote_addr;
        proxy_pass http://localhost:8080;
        proxy_redirect default;
        client_max_body_size 1000m;
    } 

    location / {
        proxy_pass http://127.0.0.1:8080/;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/sojourner-under-sabotage.se2.fim.uni-passau.de/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/sojourner-under-sabotage.se2.fim.uni-passau.de/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server {
    if ($host = sojourner-under-sabotage.se2.fim.uni-passau.de) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name 132.231.1.166;
    server_name sojourner-under-sabotage.se2.fim.uni-passau.de;
    return 404; # managed by Certbot


}

server {
    server_name 132.231.1.166;
    server_name sojourner-under-sabotage.se2.fim.uni-passau.de;

    location /websocket {
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header HOST $host;
        proxy_set_header X_Forwarded_For $remote_addr;
        proxy_pass http://localhost:8080;
        proxy_redirect default;
        client_max_body_size 1000m;
    } 

    location / {
        proxy_pass http://127.0.0.1:8080/;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/sojourner-under-sabotage.se2.fim.uni-passau.de/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/sojourner-under-sabotage.se2.fim.uni-passau.de/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server {
    if ($host = sojourner-under-sabotage.se2.fim.uni-passau.de) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name 132.231.1.166;
    server_name sojourner-under-sabotage.se2.fim.uni-passau.de;
    return 404; # managed by Certbot


}

Do I need to change anything on the Java Spring side or the Tomcat setup?

55 replies

JCHJava Community | Help. Code. Learn.

•Created by <Tim> on 4/24/2024 in #java-help

java.lang.NoSuchFieldError: UUID

When I try to deploy my WAR archive on the tomcat 10 I just set up (Debian, Tomcat 10.1.23, MySQL 8.24), I get the following error:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: UUID
        at 
...
Caused by: java.lang.NoSuchFieldError: UUID
        at 
...

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: UUID
        at 
...
Caused by: java.lang.NoSuchFieldError: UUID
        at 
...

The only thing I could find on the internet about it was https://stackoverflow.com/q/76296222/6336728 I use Hibernate 6.2.7, so I downgraded to JPA 3.0.12 and Hibernate 6.1.7.Final. Now I get a java.util.zip.ZipException: zip END header not found, even though jar xvf archive.war works fine.

14 replies

JCHJava Community | Help. Code. Learn.

•Created by <Tim> on 3/20/2024 in #java-help

Problems with an ArrayIndexOutOfBoundsException

Context I have source code (as a String) that I compile in memory with the Java compiler API. I then transform the bytecode to add instrumentation: mainly tracking line coverage and obtaining variable changes. What I'm trying to do Now I want to add logging. For this I want to replace calls to System.out.println with my own logging function. (This is necessary, because (1) my custom class loader blocks loading of the System class and (2) because I want the log information stored along with the other data and contain class, method and line number of the call.) What already works Simply calling System.out.println("Hello, World!"); works already. Concatenating a string with a variable works now as well, e.g. System.out.println("x = " + x); The transformation is done with the MethodVisitor from ASM:

@Override
public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {
    if (owner.equals("java/io/PrintStream") && name.equals("println") && descriptor.equals("(Ljava/lang/String;)V")) {
        visitLdcInsn(classId);
        visitLdcInsn(pMethodName);
        super.visitMethodInsn(
                Opcodes.INVOKESTATIC,
                Type.getInternalName(Debug.class),
                "log",
                "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V",
                false);
    } else {
        super.visitMethodInsn(opcode, owner, name, descriptor, isInterface);
    }
}

@Override
public void visitFieldInsn(int opcode, String owner, String name, String desc) {
    if (opcode == Opcodes.GETSTATIC
            && owner.equals("java/lang/System")
            && name.equals("out")
            && desc.equals("Ljava/io/PrintStream;")) {
        // needs to be loaded to keep stack size valid
        super.visitFieldInsn(opcode, Type.getInternalName(Debug.class), "dummyStream", desc);
    } else {
        super.visitFieldInsn(opcode, owner, name, desc);
    }
}

@Override
public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {
    if (owner.equals("java/io/PrintStream") && name.equals("println") && descriptor.equals("(Ljava/lang/String;)V")) {
        visitLdcInsn(classId);
        visitLdcInsn(pMethodName);
        super.visitMethodInsn(
                Opcodes.INVOKESTATIC,
                Type.getInternalName(Debug.class),
                "log",
                "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V",
                false);
    } else {
        super.visitMethodInsn(opcode, owner, name, descriptor, isInterface);
    }
}

@Override
public void visitFieldInsn(int opcode, String owner, String name, String desc) {
    if (opcode == Opcodes.GETSTATIC
            && owner.equals("java/lang/System")
            && name.equals("out")
            && desc.equals("Ljava/io/PrintStream;")) {
        // needs to be loaded to keep stack size valid
        super.visitFieldInsn(opcode, Type.getInternalName(Debug.class), "dummyStream", desc);
    } else {
        super.visitFieldInsn(opcode, owner, name, desc);
    }
}

So I mainly switch out the call to a printStreams println with the call to my logging function and I switch out accessing System.out with fetching a dummy PrintStream (that does nothing) from my Debug class. In bytecode this means that an access to System.out.println is replaced with:

 7: getstatic     #50                 // Field de/tim_greller/susserver/model/execution/instrumentation/Debug.dummyStream:Ljava/io/PrintStream;
10: ldc           #13                 // String Hello, World!
12: ldc           #38                 // String Demo#[email protected]
14: ldc           #51                 // String add
16: invokestatic  #55                 // Method de/tim_greller/susserver/model/execution/instrumentation/Debug.log:(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V

 7: getstatic     #50                 // Field de/tim_greller/susserver/model/execution/instrumentation/Debug.dummyStream:Ljava/io/PrintStream;
10: ldc           #13                 // String Hello, World!
12: ldc           #38                 // String Demo#[email protected]
14: ldc           #51                 // String add
16: invokestatic  #55                 // Method de/tim_greller/susserver/model/execution/instrumentation/Debug.log:(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V

which in Java means:

PrintStream var10000 = Debug.dummyStream;
Debug.log("Hello, World!", "Demo#[email protected]", "add");

PrintStream var10000 = Debug.dummyStream;
Debug.log("Hello, World!", "Demo#[email protected]", "add");

9 replies

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