Category Archives: Error

[Solved] springboot thymeleaf property is empty error: el1007e

1.Error Messages:
org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field ‘id’ cannot be found on null

2. Html Page

<input type="hidden" name="id" th:value="${sysDict.id}">

When the sysdict object is null, ${sysdict.ID} is a null pointer exception, so an error is reported.

3. Solution

Add a null judgment: ${sysdict?.ID}

<input type="hidden" name="id" th:value="${sysDict?.id}">

4. Details of error reporting

 
org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'id' cannot be found on null
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:406)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:112)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:337)
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:265)
    at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
    at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
    at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
    at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
    at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
    at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
    at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918)
    at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260)
    at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256)
    at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169)
    at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104)
    at org.attoparser.HtmlVoidElement.handleOpenElementEnd(HtmlVoidElement.java:92)
    at org.attoparser.HtmlMarkupHandler.handleOpenElementEnd(HtmlMarkupHandler.java:297)
    at org.attoparser.MarkupEventProcessorHandler.handleOpenElementEnd(MarkupEventProcessorHandler.java:402)
    at org.attoparser.ParsingElementMarkupUtil.parseOpenElement(ParsingElementMarkupUtil.java:159)
    at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:710)
    at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)
    at org.attoparser.MarkupParser.parse(MarkupParser.java:257)
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230)
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100)
    at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
    at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366)
    at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1400)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1145)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1084)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.zj31mep.security.XssFilter.doFilter(XssFilter.java:25)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.zj31mep.security.CsrfFilter.doFilter(CsrfFilter.java:86)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

[Solved] gradle sync Error: “PKIX path building failed” and “unable to find valid certification path to requested target”

I encountered this problem when I was in gradle sync, which led to the failure of sync, so I couldn’t update the online Maven package, resulting in the red of idea

Gradle sync reports the following error

sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Relevant discussions can be found on the Internet at:
...

I encountered this problem because Charles opened the MacOS proxy, which led to the failure of certificate verification. Just turn off Charles’s MacOS proxy (windows should also turn off the computer proxy)

[Solved] Oracle :value too large for column “SCHEMA”.”TABLE”.”COLUMN” (actual: 519, maximum: 500)

Reason: I use create table XXX as subquery to create a data table, which is mainly used to aggregate the relevant data, and then export it as an SQL script file to import it into the new library, resulting in inconsistent field types and lengths of some insert into statements due to inconsistent database character sets, This will fail to insert value too large for column “schema” “TABLE”. “COLUMN” (actual: 519, maximum: 500) ； Because the length is incompatible

The solution is to use convert to convert the character set or cast to increase the length of the type on the error field of the corresponding select, and then create table will be the type of table structure according to the field type you set; However, after using convert to convert the character set, the query will result in ora-29275: partial multibyte character error.

So my solution here is to use cast conversion type

CREATE TABLE XXX AS

SELECT CAST(col AS VARCHAR(1000)),… FROM xxx;

Cast function document: https://docs.oracle.com/database/121/SQLRF/functions024.htm#SQLRF00613

Example of using the convert function:

CREATE TABLE XXX AS

SELECT CONVERT(col,’AL32UTF8′),… FROM xxx;

Convert function document: https://docs.oracle.com/database/121/SQLRF/functions041.htm#SQLRF00620

If only the CONVERT SELECT clause is executed, an error will occur ORA-29275: partial multibyte character, but CREATE TABLE XXX AS SELECT will be executed together without error, but the table generated by the query will also report an error ORA-29275.

[Solved] Prometheus Time Error: Warning! Detected 60.44 seconds time difference between your browser and the server. Prometheus relies on accurate time and time drift might cause unexpected query results.

Error message

Warning!  Detected 60.44 seconds time difference between your browser and the server. Prometheus relies on accurate time and time drift might cause unexpected query results.

There is a time difference between the browser and the server. Prometheus relies on accurate time. The time difference will lead to inaccurate data queried.

Solution:

yum install -y ntp

ntpdate -u time1.aliyun.com

Chrome66 Auto Play Error: Uncaught (in promise) DOMException: play() failed because the user didn’t interact with the document first

After version 66, users are prohibited from entering the page to automatically trigger audio or video playback

The user must manually click play to play, so there is an error message like this

Two Methods:

  1. Guide the user to click to turn on the sound.
  2. Mute by default after entering the page.

By default, enter the page mute and add muted to the audio

Add a watch

watch: {
    isOpenMusic: {
      handler(val) {
        if (val) {
           this .$refs.audio.muted = "" ;
          console.log( "There is sound" );
        } else {
           this .$refs.audio.muted = "muted" ;
          console.log( "Mute" );
        }
      },
    },
  },

Give a button to switch dynamically

< i class ="iconfont" style ="font-size: 1.2rem; cursor: pointer; color: #ffffff" :class ="[isOpenMusic?'icon-shengyin':'icon- shengyinguanbi ']" @click ="isOpenMusic = !isOpenMusic" >

methods

audioPlay() {
      setTimeout(() => {
         this .$refs.audio.play();
      }, 10 );
},

sockets hook

socket:{
 // listening user list 
    updateUserList(data) {
       this .loginUserList = data;
       if ( this .isOpenMusic) {
         this .audioSrc = require("../assets/上线.wav" );
         this .audioPlay();
      }
    },
}

In this way, the default sound of the user coming in the page is off, and you need to manually click to open the sound to hear the update of the chat room user list

[Solved] Handler dispatch failed; nested exception is java.lang.AbstractMethodError: com.shiku.im.dao.impl.FriendsDaoImpl.queryFriendsByName(ILjava/lang/String;)Ljava/util/List

Interface error:

Handler dispatch failed; nested exception is java.lang.AbstractMethodError:
com.shiku.im.dao.impl.FriendsDaoImpl.queryFriendsByName(ILjava/lang/String;)Ljava/util/List

Local debugging is good. An error will be reported when it is released to the test environment!

The final reason is the problem of distributed project compilation. The interface of module A is implemented in module B, and B is not compiled before compiling A.

How to Solve Error: buuctf re [MRCTF2020]Xor

Direct IDA without shell

Errors found

The main function cannot F5, so just enter the error reporting line, F5, and then exit

int __cdecl main(int argc, const char **argv, const char **envp)
{
  unsigned int i; // eax

  sub_401020((int)"Give Me Your Flag String:\n");
  sub_401050("%s", byte_4212C0);
  if ( strlen(byte_4212C0) != 27 )
  {
LABEL_6:
    sub_401020((int)"Wrong!\n");
    sub_404B7E("pause");
    _loaddll(0);
    __debugbreak();
  }
  for ( i = 0; i < 0x1B; ++i )
  {
    if ( ((unsigned __int8)i ^ (unsigned __int8)byte_4212C0[i]) != byte_41EA08[i] )
      goto LABEL_6;
  }
  sub_401020((int)"Right!\n");
  sub_404B7E("pause");
  return 0;
}

View byte_41ea08 content

.rdata:0041EA08 byte_41EA08     db 4Dh                  ; DATA XREF: _main+48↑r
.rdata:0041EA09 aSawbFxzJTqjNBp db 'SAWB~FXZ:J:`tQJ"N@ bpdd}8g',0

Isochronize byte_41EA08 by bit back

a = "MSAWB~FXZ:J:`tQJ\"N@ bpdd}8g"
flag = ''
for i in range(len(a)):
    flag += chr(i ^ord(a[i]))
print(flag)

[Solved] Webassembly cannot be opened in IOS 12 and below and debug error: referenceerror: cant find variable: globalthis

Debugging shows that you are executing dotnet 6.0.0.fof53xxcmn.JS referenceerror: cant find variable: globalthis error

 

Add the following code:

<script>
        !function(t){function e(){var e=this||self;e.globalThis=e,delete t.prototype._T_}"object"!=typeof globalThis&&(this?e():(t.defineProperty(t.prototype,"_T_",{configurable:!0,get:e}),_T_))}(Object);
</script>

OBS Error: obs has crashed! [How to Solve]

 

You can check the problems according to the saved log. 90% of the reasons are caused by the graphics card

The notebook is a dual graphics card. After disabling the core display, you can normally open obs. In that case, we uninstall the core display driver and let win10 download it online. In this way, you can normally open OBS and use the core display!

Therefore, the temporary solution is to uninstall the kernel display and let win10 download the driver online.

Should I say it or not, Intel’s last generation UHD core really collapsed, and we look forward to the catch-up of Godson in the next 10!