The extension for free marker template file needs to be updated to (.ftlh ) for Spring Boot 2.2.x applications

after uploading a small file 26kB, the webpage returns
Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sun Nov 03 11:05:59 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available

while at the intellij console
2019-11-03 11:03:57.656 INFO 30032 --- [ main] c.e.s.SpringBootFileUploadApplication : No active profile set, falling back to default profiles: default
2019-11-03 11:04:00.013 INFO 30032 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-11-03 11:04:00.020 INFO 30032 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-11-03 11:04:00.021 INFO 30032 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.27]
2019-11-03 11:04:00.076 INFO 30032 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-11-03 11:04:00.077 INFO 30032 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2364 ms
2019-11-03 11:04:00.177 INFO 30032 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-11-03 11:04:00.213 INFO 30032 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html]
2019-11-03 11:04:00.271 INFO 30032 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-11-03 11:04:00.274 INFO 30032 --- [ main] c.e.s.SpringBootFileUploadApplication : Started SpringBootFileUploadApplication in 3.034 seconds (JVM running for 3.603)
2019-11-03 11:04:20.426 INFO 30032 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-11-03 11:04:20.427 INFO 30032 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-11-03 11:04:20.432 INFO 30032 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 4 ms

No particular error were identified, and I could not find the project in this repo called spring boot file upload to compare, which is quite unfortunate. What's the source of the problem. I'm sure it's not the size of the upload file, since I've encountered this problem and the console returned an error message for the size. I replace the large file with a tiny one so that the error message didn't come up again. However the webpage became what's described above。

For the binary search solution (), the binary search algorithm is not working finding the first and the last numbers.
I propose this approach.

`public static int findTarget(int[] arr, int target) {
if (arr.length == 0) return -1;

    int start = 0, end = arr.length;
    while (start<=end) {
        int mid = (start+end)/2;
        if(arr[mid]==target)
            return mid;
        else if(arr[mid]<target){
            start=mid+1;
        }
        else {
            end=mid-1;
        }
    }
    return -1;
}`

Hy,

The branches for the solutions are publicly available, I don't think that this is intentional.

本人原始案例：https://github.com/yizhiwazi/springboot-socks/tree/master/springboot-websocket-chat

I'm the original author. It's not a problem for you to borrow the project, but you should note the original source, not just copy it.

The PermutationDemo.java program will lead to duplicates. A quick fix is to do the inner loop on the clone of the array.

    public static void printPermutn(int[] arr, int index) {
        int len = arr.length;

        if (index == (len-1)) {
            for(int i=0; i<len; i++) System.out.print(arr[i]);
            System.out.println();
        } else {
            int[] a = arr.clone();
            for(int i=index; i<len; i++) {
                int t = a[i];
                a[i] = a[index];
                a[index] = t;
                printPermutn(a, index+1);
            }
        }
    }

I get this error when trying to access it from http://localhost:8080/graphiql
{ "timestamp": "2019-12-16T10:31:24.110+0000", "status": 404, "error": "Not Found", "message": "No message available", "path": "/graphql" }

when I try to access from http://localhost:8080/graphql/schema.json

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Dec 16 12:45:56 CAT 2019
There was an unexpected error (type=Not Found, status=404).
No message available