java.time.zone.ZoneRulesException occurs while validating time zone This exception is used to indicate problems with configured time zone rules.

Constructors

• ZoneRulesException(String message) : Constructs a new date-time exception with the specified message.
• ZoneRulesException(String message, Throwable cause) : Constructs a new date-time exception with the specified message and cause.

Sample Code

try
{
// Will throw java.time.zone.ZoneRulesException: Unknown time-zone ID: IST
LocalDate todayIST = LocalDate.now(ZoneId.of("IST"));
}
catch(ZoneRulesException ex)
{
ex.printStackTrace();
}

Output Message

java.time.zone.ZoneRulesException: Unknown time-zone ID: IST
    at java.time.zone.ZoneRulesProvider.getProvider(Unknown Source)
    at java.time.zone.ZoneRulesProvider.getRules(Unknown Source)
    at java.time.ZoneRegion.ofId(Unknown Source)
    at java.time.ZoneId.of(Unknown Source)
    at java.time.ZoneId.of(Unknown Source)
    at datetime.Java8DateTime.localDateAPI(Java8DateTime.java:173)
    at datetime.Java8DateTime.main(Java8DateTime.java:34)

Issue

Here with throw ZoneRulesException if pass as Invalidate time-zone. For above example passing time-zone as IST.

Solutions

A ZoneId is unique id with in System which is used to identify rules to convert between Instant and LocalDateTime. Thre are two distict type of ID:

• Fixed offsets – a fully resolved offset from UTC/Greenwich, that uses the same offset for all local date-times. Most fixed offsets are represented by ZoneoffSet as + or -.
• Geographical regions – an area where a specific set of rules for finding the offset from UTC/Greenwich apply.

Ex: A time-zone ID, such as Europe/Paris.

Refer below mapping while pass ZoneId value here for above example use Asia/Kolkata as below.

• HST – -10:00
• EST – -05:00
• MST – -07:00
• ACT – Australia/Darwin
• AET – Australia/Sydney
• AGT – America/Argentina/Buenos_Aires
• ART – Africa/Cairo
• AST – America/Anchorage
• BET – America/Sao_Paulo
• BST – Asia/Dhaka
• CAT – Africa/Harare
• CNT – America/St_Johns
• CST – America/Chicago
• CTT – Asia/Shanghai
• EAT – Africa/Addis_Ababa
• ECT – Europe/Paris
• IET – America/Indiana/Indianapolis
• IST – Asia/Kolkata
• JST – Asia/Tokyo
• MIT – Pacific/Apia
• NET – Asia/Yerevan
• NST – Pacific/Auckland
• PLT – Asia/Karachi
• PNT – America/Phoenix
• PRT – America/Puerto_Rico
• PST – America/Los_Angeles
• SST – Pacific/Guadalcanal
• VST – Asia/Ho_Chi_Minh

try
{
// Will throw java.time.zone.ZoneRulesException: Unknown time-zone ID: IST
LocalDate todayIST = LocalDate.now(ZoneId.of("Asia/Kolkata"));
}
catch(ZoneRulesException ex)
{
ex.printStackTrace();
}

More Issues Solution

For more other JAVA/JDBC issues solution follow link JAVA/JDBC Issues.Sample Code