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portfolio/infra-run/scripts/python/jvm-log-analyzer/examples/sample-jvm-report.md
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Mateusz Suski 89b7fabb96 Add JVM log analyzer tool
2026-05-11 17:05:27 +00:00

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JVM Log Analyzer

  • Overall status: CRITICAL
  • Finding language is a triage summary; logs alone do not prove root cause.

CRITICAL: CertificateExpiredException

  • Occurrences: 1
  • Symptom: tls_certificate
  • First seen: 2026-05-11 10:16:40
  • Last seen: 2026-05-11 10:16:40
  • Stack traces linked: 0

Sample log lines:

Caused by: java.security.cert.CertificateExpiredException: NotAfter: Mon May 11 10:00:00 UTC 2026

CRITICAL: CommunicationsException

  • Occurrences: 1
  • Symptom: database
  • First seen: 2026-05-11 10:13:02
  • Last seen: 2026-05-11 10:13:02
  • Stack traces linked: 0

Sample log lines:

Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

CRITICAL: connection pool exhausted

  • Occurrences: 1
  • Symptom: database
  • First seen: 2026-05-11 10:12:55
  • Last seen: 2026-05-11 10:12:55
  • Stack traces linked: 0

Sample log lines:

2026-05-11 10:12:55 ERROR inventory-api[2214] --- [HikariPool-1 housekeeper] com.zaxxer.hikari.pool.HikariPool : connection pool exhausted waiting for database connection

CRITICAL: database unavailable

  • Occurrences: 1
  • Symptom: database
  • First seen: 2026-05-11 10:13:02
  • Last seen: 2026-05-11 10:13:02
  • Stack traces linked: 0

Sample log lines:

2026-05-11 10:13:02 ERROR inventory-api[2214] --- [http-nio-8080-exec-4] com.example.db.InventoryRepository : database unavailable during checkout commit

CRITICAL: FATAL

  • Occurrences: 1
  • Symptom: fatal
  • First seen: 2026-05-11 10:21:27
  • Last seen: 2026-05-11 10:21:27
  • Stack traces linked: 0

Sample log lines:

2026-05-11 10:21:27 FATAL inventory-api[2214] --- [main] org.apache.catalina.core.StandardService : JVM failure detected, stopping service

CRITICAL: Java heap space

  • Occurrences: 1
  • Symptom: jvm_memory
  • First seen: 2026-05-11 10:21:27
  • Last seen: 2026-05-11 10:21:27
  • Stack traces linked: 0

Sample log lines:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

CRITICAL: OutOfMemoryError

  • Occurrences: 1
  • Symptom: jvm_memory
  • First seen: 2026-05-11 10:21:27
  • Last seen: 2026-05-11 10:21:27
  • Stack traces linked: 1

Sample log lines:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

Stack trace samples:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at java.base/java.util.Arrays.copyOf(Arrays.java:3537)
        at java.base/java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:228)
        at com.example.cache.ReportCache.loadAll(ReportCache.java:87)

CRITICAL: SQLRecoverableException

  • Occurrences: 1
  • Symptom: database
  • First seen: 2026-05-11 10:13:02
  • Last seen: 2026-05-11 10:13:02
  • Stack traces linked: 1

Sample log lines:

java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection

Stack trace samples:

java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:743)
        at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:666)
Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
        ... 2 more

CRITICAL: SSLHandshakeException

  • Occurrences: 1
  • Symptom: tls_certificate
  • First seen: 2026-05-11 10:16:40
  • Last seen: 2026-05-11 10:16:40
  • Stack traces linked: 1

Sample log lines:

2026-05-11 10:16:40 ERROR inventory-api[2214] --- [cert-refresh] com.example.security.TrustStoreLoader : javax.net.ssl.SSLHandshakeException: PKIX path validation failed

Stack trace samples:

2026-05-11 10:16:40 ERROR inventory-api[2214] --- [cert-refresh] com.example.security.TrustStoreLoader : javax.net.ssl.SSLHandshakeException: PKIX path validation failed
Caused by: java.security.cert.CertificateExpiredException: NotAfter: Mon May 11 10:00:00 UTC 2026
        at sun.security.provider.certpath.BasicChecker.verifyTimestamp(BasicChecker.java:194)

WARNING: ERROR

  • Occurrences: 8
  • Symptom: log_level
  • First seen: 2026-05-11 10:05:31
  • Last seen: 2026-05-11 10:18:06
  • Stack traces linked: 0

Sample log lines:

2026-05-11 10:05:31 ERROR inventory-api[2214] --- [http-nio-8080-exec-7] com.example.orders.OrderController : request failed while loading order id=4812
2026-05-11 10:09:13 ERROR inventory-api[2214] --- [pool-4-thread-1] com.example.integration.TaxClient : java.net.ConnectException: connection refused connecting to tax-service:8443
2026-05-11 10:12:55 ERROR inventory-api[2214] --- [HikariPool-1 housekeeper] com.zaxxer.hikari.pool.HikariPool : connection pool exhausted waiting for database connection

Top Exception Types

Value Count
NullPointerException 1
IllegalStateException 1
SocketTimeoutException 1
ConnectException 1
SQLRecoverableException 1
CommunicationsException 1
SSLHandshakeException 1
CertificateExpiredException 1
OutOfMemoryError 1

Top Operational Symptoms

Value Count
log_level 10
database 4
http_5xx 3
application_exception 2
network_timeout 2
network_connectivity 2
tls_certificate 2
jvm_memory 2
retry 1
fatal 1

Operational Summary

  • Overall status: CRITICAL
  • Total lines scanned: 32
  • Total findings: 29
  • Total stack traces detected: 4
  • Critical finding groups: 9
  • Warning finding groups: 11
  • HTTP 5xx count: 3
  • Parsed timestamps count: 13
  • Unknown timestamps count: 19
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