enable healthcheck for sql connection

[thoniTUB]

HealthCheck-Endpoint, when DB is down:

{
  "HikariPool-1.pool.ConnectivityCheck" : {
    "healthy" : false,
    "message" : "HikariPool-1 - Connection is not available, request timed out after 30015ms.",
    "error" : {
      "type" : "java.sql.SQLTransientConnectionException",
      "message" : "HikariPool-1 - Connection is not available, request timed out after 30015ms.",
      "stack" : [ "com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:696)", "com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:181)", "com.zaxxer.hikari.metrics.dropwizard.CodahaleHealthChecker$ConnectivityHealthCheck.check(CodahaleHealthChecker.java:95)", "com.codahale.metrics.health.HealthCheck.execute(HealthCheck.java:374)", "com.codahale.metrics.health.HealthCheckRegistry.runHealthChecks(HealthCheckRegistry.java:184)", "io.dropwizard.metrics.servlets.HealthCheckServlet.runHealthChecks(HealthCheckServlet.java:177)", "io.dropwizard.metrics.servlets.HealthCheckServlet.doGet(HealthCheckServlet.java:146)", "jakarta.servlet.http.HttpServlet.service(HttpServlet.java:500)", "jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)", "io.dropwizard.metrics.servlets.AdminServlet.service(AdminServlet.java:154)", "jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)", "org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)", "org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)", "io.dropwizard.jersey.filter.AllowedMethodsFilter.handle(AllowedMethodsFilter.java:46)", "io.dropwizard.jersey.filter.AllowedMethodsFilter.doFilter(AllowedMethodsFilter.java:40)", "org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)", "org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)", "org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)", "org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)", "org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)", "org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)", "org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)", "org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)", "org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)", "org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)", "io.dropwizard.jetty.RoutingHandler.handle(RoutingHandler.java:52)", "org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)", "org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:822)", "io.dropwizard.jetty.ZipExceptionHandlingGzipHandler.handle(ZipExceptionHandlingGzipHandler.java:26)", "org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:46)", "org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:173)", "org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)", "org.eclipse.jetty.server.Server.handle(Server.java:563)", "org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)", "org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)", "org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)", "org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)", "org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)", "org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)", "org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)", "org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)", "org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)", "org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)", "org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)", "org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)", "org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)", "org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)", "org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)", "java.base/java.lang.Thread.run(Thread.java:840)" ],
      "cause" : {
        "type" : "org.postgresql.util.PSQLException",
        "message" : "Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.",
        "stack" : [ "org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:342)", "org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:54)", "org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:253)", "org.postgresql.Driver.makeConnection(Driver.java:434)", "org.postgresql.Driver.connect(Driver.java:291)", "com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)", "com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:359)", "com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201)", "com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:470)", "com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:733)", "com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:712)", "java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)", "java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)", "java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)", "java.base/java.lang.Thread.run(Thread.java:840)" ],
        "cause" : {
          "type" : "java.net.ConnectException",
          "message" : "Connection timed out: getsockopt",
          "stack" : [ "java.base/sun.nio.ch.Net.pollConnect(Native Method)", "java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672)", "java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:554)", "java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:602)", "java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)", "java.base/java.net.Socket.connect(Socket.java:633)", "org.postgresql.core.PGStream.createSocket(PGStream.java:243)", "org.postgresql.core.PGStream.<init>(PGStream.java:98)", "org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:132)", "org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:258)", "org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:54)", "org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:253)", "org.postgresql.Driver.makeConnection(Driver.java:434)", "org.postgresql.Driver.connect(Driver.java:291)", "com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)", "com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:359)", "com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201)", "com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:470)", "com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:733)", "com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:712)", "java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)", "java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)", "java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)", "java.base/java.lang.Thread.run(Thread.java:840)" ]
        }
      }
    },
    "duration" : 30015,
    "timestamp" : "2024-08-09T14:03:12.811+02:00"
  },
  "deadlocks" : {
    "healthy" : true,
    "duration" : 0,
    "timestamp" : "2024-08-09T14:03:12.811+02:00"
  }
}

when it is up again

{
  "HikariPool-1.pool.ConnectivityCheck" : {
    "healthy" : true,
    "duration" : 38,
    "timestamp" : "2024-08-09T14:06:46.497+02:00"
  },
  "deadlocks" : {
    "healthy" : true,
    "duration" : 0,
    "timestamp" : "2024-08-09T14:06:46.497+02:00"
  }
}

When the DB is down, the health check request returns after the connection/connectivity timeout is over (default 30 s).

The reconnect only works if the database connection could be established upon server start.

[awildturtok]

Sind rot fyi