Hi Guys! I need help figuring out how to correct my code. I'm trying to run a checksum for the first time and I keep running into errors. I hope to figure out how to fix these! The code: package com.snhu.sslserver; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.nio.charset.StandardCharsets; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; @SpringBootApplication public class SslServerApplication { publicstaticvoidmain(String[]args){ SpringApplication.run(SslServerApplication.class,args); } } @RestController class SslserverController { @RequestMapping("/hash")
Hi Guys! I need help figuring out how to correct my code. I'm trying to run a checksum for the first time and I keep running into errors. I hope to figure out how to fix these!
The code:
package com.snhu.sslserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
@SpringBootApplication
public class SslServerApplication {
publicstaticvoidmain(String[]args){
SpringApplication.run(SslServerApplication.class,args);
}
}
@RestController
class SslserverController {
@RequestMapping("/hash")
publicStringgetHash()throwsNoSuchAlgorithmException{
Stringdata="Hello World, Check Sum!";
Stringname="KT";
String[]splitName=name.split(" ");
StringfirstName=splitName[0];
StringlastName=splitName[splitName.length-1];
name=firstName+" "+lastName;
MessageDigestmd=MessageDigest.getInstance("SHA-256");
byte[]sha256=md.digest(name.getBytes(StandardCharsets.UTF_8));
return"Data: "+data+"<br/><br/>"
+"Name: "+name+"<br/><br/>"
+"Name of cipher
+"CheckSum value: "+bytesToHex(sha256);
}
privateStringbytesToHex(byte[]sha256){
StringBuilderchecksum=newStringBuilder();
for(byteb:sha256){
Stringhex=Integer.toHexString(0xff&b);
if(hex.length()==1)
checksum.append('0');
checksum.append(hex);
}
returnchecksum.toString();
}
}
![### Error Log Analysis: Understanding Spring Boot and Tomcat Server Issues
This error log is generated from an application using Spring Boot with an embedded Tomcat server. It highlights a series of cascading failures that prevent the server from starting. Below is a step-by-step breakdown of the errors and their potential causes.
#### Main Error Message
- **`org.springframework.boot.web.server.WebServerException:`**
- **Description:** Unable to start embedded Tomcat server.
- **Location in Code:** Occurred at `TomcatWebServer.java:215`.
#### Subsequent Causes
1. **`java.lang.IllegalArgumentException:`**
- **Issue:** StandardService.connector.start failed.
- **Details:** Located in `TomcatWebServer.java:278`, within `SpringApplication.java:197`. This indicates an issue initializing the server connectors.
2. **`org.apache.catalina.LifecycleException:`**
- **Issue:** Protocol handler start failed.
- **Source:** Connector encountered issues in `StandardService.java:227`. The problem likely occurs due to incorrect configuration of server protocols.
3. **`java.lang.IllegalArgumentException:`**
- **Issue:** Failed to load keystore type [????] with path.
- **Path Noted:** `file:/C:/Users/katel/eclipse-workspace/ssl-server_student/%3F%3F%3F%3F`.
- **Details:** At `AbstractJSSEEndpoint.java:71`, suggesting that the keystore file or type identifier is invalid or missing.
4. **`java.io.IOException:`**
- **Issue:** Failed to load keystore type.
- **Reason:** Likely due to file or path errors (not found).
- **Occurrences:** Highlighted in `SSLHostConfig.java:363` and related classes handling SSL/TLS.
#### Common Frames Omitted
The log notes several instances where "common frames" are omitted, streamlining repetitive parts of the stack trace for clarity.
#### Key Takeaways
- **Configuration Errors:** The errors suggest problems with the SSL configuration, specifically related to the keystore type and path.
- **Missing Resources:** There is a likely issue with file paths or missing files in the SSL setup.
- **Resolution Steps:**
- Verify the existence and correctness of paths for SSL files.
- Ensure the keystore type is correctly specified and supported by your configuration.
- Check application properties for syntax](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F97fa71a9-ddb9-496b-9b0a-bf970e388fad%2Fa421ddb4-6f55-40a9-a316-1578f7f9a4cd%2Fvn697zg_processed.png&w=3840&q=75)
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