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initializes com.mysql.jdbc.TimeUtil.timeZoneMappings if needed (Connector/J 5.x) #259

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Merged
merged 3 commits into from
Aug 18, 2024
Merged

initializes com.mysql.jdbc.TimeUtil.timeZoneMappings if needed (Connector/J 5.x) #259

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164272d
Call loadTimeZoneMappings only if the TimeUtil class is com.mysql.jdb…
hiroyuki-sato Aug 10, 2024
41163b9
Move the logic into loadTimeZoneMappings.
hiroyuki-sato Aug 18, 2024
53dee52
Fix review comments
hiroyuki-sato Aug 18, 2024
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21 changes: 17 additions & 4 deletions embulk-input-mysql/src/main/java/org/embulk/input/mysql/MySQLInputPlugin.java
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,7 @@ protected MySQLInputConnection newConnection(PluginTask task) throws SQLExceptio
logConnectionProperties(url, props);

// load timezone mappings
loadTimeZoneMappings();
loadTimeZoneMappingsIfNeeded();

Connection con = DriverManager.getConnection(url, props);
try {
Expand All @@ -145,7 +145,7 @@ protected ColumnGetterFactory newColumnGetterFactory(final PageBuilder pageBuild
return new MySQLColumnGetterFactory(pageBuilder, dateTimeZone);
}

private void loadTimeZoneMappings()
private void loadTimeZoneMappingsIfNeeded()
{
// Here initializes com.mysql.jdbc.TimeUtil.timeZoneMappings static field by calling
// static timeZoneMappings method using reflection.
Expand All @@ -156,7 +156,11 @@ private void loadTimeZoneMappings()
// from the classloader. It seems like a bug of JDBC Driver where it should use the class loader
// that loaded com.mysql.jdbc.TimeUtil class rather than system class loader to read the
// property file because the file should be in the same classpath with the class.
// Here implements a workaround as as workaround.
// Here implements a workaround as a workaround.
//
// This workaround seems required only for Connector/J 5.x (com.mysql.jdbc.TimeUtil),
// not necessary for Connector/J 8.x (com.mysql.cj.util.TimeUtil).
// TODO: Clarify for Connector/J 8.x just in case.
Field f = null;
try {
Class<?> timeUtilClass = Class.forName("com.mysql.jdbc.TimeUtil");
Expand All @@ -172,7 +176,16 @@ private void loadTimeZoneMappings()
f.set(null, timeZoneMappings);
}
}
catch (ClassNotFoundException | IllegalAccessException | NoSuchFieldException | IOException e) {
catch (ClassNotFoundException e) {
try {
Class.forName("com.mysql.cj.util.TimeUtil");
} catch (final ClassNotFoundException ex2) {
// Throw if neither the Connector/J 5.x nor 8.x driver is found.
throw new RuntimeException(e);
}
}
// Pass-through if the Connector/J 8.x driver is found. }
catch (IllegalAccessException | NoSuchFieldException | IOException e) {
throw new RuntimeException(e);
}
finally {
Expand Down