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  1. ,
    Expert tip

    MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this https://goo.gl/3E2qzg

  2. ,

    Make sure you are using InnoDB storage engine and READ-COMMITTED transaction isolation level and increase the database server innodb_lock_wait_timeout variable to about 500.

Solutions on the web

via Atlassian JIRA by Igor Minar, 1 year ago
via Atlassian JIRA by Igor Minar, 1 year ago
via Stack Overflow by user3355696
, 2 years ago
Connection is read-only. Queries leading to data modification are not allowed
via nabble.com by Unknown author, 1 year ago
Connection is read-only. Queries leading to data modification are not allowed
via netbeans.org by Unknown author, 2 years ago
Invalid value for getInt() - 'H' in column 6
via Google Groups by Ajay, 9 months ago
Binary logging not possible. Message: Transaction level 'READ-COMMITTED' in InnoDB is not safe for binlog mode 'STATEMENT'
java.sql.SQLException: Column 'count' not found.	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)	at com.mysql.jdbc.ResultSet.findColumn(ResultSet.java:987)	at com.mysql.jdbc.ResultSet.getInt(ResultSet.java:2749)	at com.mchange.v2.c3p0.impl.NewProxyResultSet.getInt(NewProxyResultSet.java:2677)	at com.atlassian.confluence.links.DefaultReferralManager.deleteReferrersWithPrefix(DefaultReferralManager.java:196)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:284)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:20)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:56)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)	at $Proxy35.deleteReferrersWithPrefix(Unknown Source)	at com.atlassian.confluence.admin.actions.PurgeReferrersAction.doPurgeSingleReferrer(PurgeReferrersAction.java:37)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:302)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:55)	at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:39)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.atlassian.confluence.core.ConfluenceValidationInterceptor.intercept(ConfluenceValidationInterceptor.java:16)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.util.LoggingContextInterceptor.intercept(LoggingContextInterceptor.java:48)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.security.actions.PermissionCheckInterceptor.intercept(PermissionCheckInterceptor.java:47)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.pages.actions.PageAwareInterceptor.intercept(PageAwareInterceptor.java:114)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.spaces.actions.SpaceAwareInterceptor.intercept(SpaceAwareInterceptor.java:67)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.core.actions.LastModifiedInterceptor.intercept(LastModifiedInterceptor.java:39)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.confluence.core.ConfluenceAutowireInterceptor.intercept(ConfluenceAutowireInterceptor.java:25)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.atlassian.xwork.interceptors.XWorkTransactionInterceptor.intercept(XWorkTransactionInterceptor.java:98)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)	at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:115)	at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:229)	at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:199)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:917)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:117)	at com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(ProfilingPageFilter.java:137)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:51)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.core.filters.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:21)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.confluence.util.LoggingContextFilter.doFilter(LoggingContextFilter.java:46)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.confluence.util.UserThreadLocalFilter.doFilter(UserThreadLocalFilter.java:44)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:182)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:159)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.confluence.util.ClusterHeaderFilter.doFilter(ClusterHeaderFilter.java:35)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:172)	at com.atlassian.spring.filter.FlushingSpringSessionInViewFilter.doFilterInternal(FlushingSpringSessionInViewFilter.java:29)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:140)	at com.atlassian.core.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:27)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.confluence.util.RequestCacheThreadLocalFilter.doFilter(RequestCacheThreadLocalFilter.java:25)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.core.filters.gzip.GzipFilter.doFilter(GzipFilter.java:61)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:37)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.sun.dse.wikis.auth.SsoFilter.doFilter(SsoFilter.java:145)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)	at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)