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spring源码分析之spring-messaging模块详解

spring-messaging模块为集成messagingapi和消息协议提供支持。其代码结构为：其中base定义了消息Message(MessageHeader和body)、消息处理MessageHandler、发送消息MessageChannel。1.base模块其结构如下所示：其中：message由两部分组成，...

开发笔记 ·2024-08-10

dmesg 命令介绍和用法示例

dmesg是一个Linux/Unix操作系统中的命令，用于显示内核环缓冲区的内容。它可以用来检查系统引导时的信息、硬件连接和配置、驱动程序加载信息等。以下是dmesg命令的一些常见用法示例：显示最近的内核消息dmesg#这条命令将显示内核环缓冲区中的最近的消息。这些消息通常包括系统引导信息、设备连接信息、驱动程序加载信...

开发笔记 ·2024-07-04

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections

最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...

开发笔记 ·2024-04-29

ORA-55366: unknown namespace prefix “string”

文档解释ORA-55366:unknownnamespaceprefix“string”Cause:AnattemptwasmadetomakeuseofanundefinednamespaceprefixinOracleVirtualPrivateDatabase(VPD)metadata.A...

IT技术学习 ·2023-07-28

ORA-30968: invalid XPATH or NAMESPACE option for XML Index

文档解释ORA-30968:invalidXPATHorNAMESPACEoptionforXMLIndexCause:Anattemptwasmadetouseanunsupportedoption.Action:Usetheappropriateoption.ORA-30968异常消息表明，您尝试创建的XML索引的...

IT技术学习 ·2023-07-28

ORA-32150: Cannot perform operation on a null timestamp

文档解释ORA-32150:CannotperformoperationonanulltimestampCause:Thetimestampinvolvedinthisoperationisnull.Action:Usevalid,non-nulltimestampinstancetoperformthisoperat...

IT技术学习 ·2023-07-28

ORA-30695: JDWP message format problem

文档解释ORA-30695:JDWPmessageformatproblemCause:AmessagepassedfromonesoftwaresubcomponenttoanotherusingtheJDWPprotocolappearsinvalidlyformatted.Action:Thisisaninter...

IT技术学习 ·2023-07-28

ORA-25315: unsupported configuration for propagation of buffered messages

文档解释ORA-25315:unsupportedconfigurationforpropagationofbufferedmessagesCause:Anattemptwasmadetopropagatebufferedmessageswiththedatabaselinkpointingtoaninstancein...

IT技术学习 ·2023-07-28

ORA-25228: timeout or end-of-fetch during message dequeue from string.string

文档解释ORA-25228:timeoutorend-of-fetchduringmessagedequeuefromstring.stringCause:User-specifieddequeuewaittimehaspassedortheendofthequeuehasbeenreachedbutnomessage...

IT技术学习 ·2023-07-28

ORA-24940: invalid combination of string namespace, string presentation and string receive protocol

文档解释ORA-24940:invalidcombinationofstringnamespace,stringpresentationandstringreceiveprotocolCause:Aninvalidcombinationofnamespace,presentationandreceiveprotocol...

IT技术学习 ·2023-07-28

ORA-39172: Cannot remap transportable tablespace names with compatibility of string.

文档解释ORA-39172:Cannotremaptransportabletablespacenameswithcompatibilityofstring.Cause:Theuserattemptedtoremapatablespacenameinatransportabletablespacejobwhenthec...

IT技术学习 ·2023-07-28

ORA-46057: Namespace already exists

文档解释ORA-46057:NamespacealreadyexistsCause:Thespecifiedextensiblesecurityapplicationnamespacewasalreadyinexistence.Action:Executethefunctionorprocedurewithadiffe...

IT技术学习 ·2023-07-28

ORA-24043: destination string uses a reserved name, names with AQ$_ prefix are not valid

文档解释ORA-24043:destinationstringusesareservedname,nameswithAQ$_prefixarenotvalidCause:Anattemptwasmadetospecifyareservednameforadestination.Action:Enteradifferen...

IT技术学习 ·2023-07-28

ORA-15454: ALTER DISKGROUP ALL cannot use single volume names

文档解释ORA-15454:ALTERDISKGROUPALLcannotusesinglevolumenamesCause:AnALTERDISKGROUPALLcommandspecifiedasinglevolumeoralistofvolumesAction:UsetheALLkeywordwhenspecif...

IT技术学习 ·2023-07-28

ORA-46054: Invalid Namespace specified

文档解释ORA-46054:InvalidNamespacespecifiedCause:Aninvalidextensiblesecurityapplicationnamespacewasspecified.Action:Checkthenamespaceandexecutethefunctionorprocedur...

IT技术学习 ·2023-07-28