IndexOutOfBoundsException - Wrong formatted content when dealing with latex String

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#1,439 opened on Aug 6, 2026 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 55/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: java
Domain: tooling

Research direction

Reproduce the failure with the supplied Java class, then inspect StringWrapper#applyReplacements and FormatterException#formatDiagnostics. Check the generated source and diagnostic line handling against the original input. Done means formatting no longer produces uncompilable Java and the formatter reports the error without IndexOutOfBoundsException.

Written by the indexing model from the issue text.

Description

Give this class

package question;

class T {

  private static final String JSON =
      "{\n"
          + "  \"a\": \"AAAAA AAA AAA AAA AA AAA AA AAAAA AA AAAAA AAA AAAA AAAA AA AAAA AAAA AAAAA AAAAA AAAAA AAAAA AAAAAA AAAAA AAAAAA AAAAA AAA at $-15.4{^{\\\\,\\\\circ}\\\\text{C}}$ BBB BBBBB BB BBB $42.7{^{\\\\,\\\\circ}\\\\text{C}}$?\\n\\n(CC CC CCC CC CCCCC CCC CCC CCC CCC CCC CC = $1.95\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$; DDD DDD DDDD DDDD DDDDD DDDD DDD DD DDDD = $1.18\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$C; $\\\\Delta H_\\\\text{fus}$ = 5.72 kJ/mol; normal freezing point, $T_f$ = $28.3{^{\\\\,\\\\circ}\\\\text{C}}$)\",\n"
          + "  \"b\": \"*EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EEE.*\\n\\nFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F $-15.4^\\\\circ\\\\text C$ to $28.3^\\\\circ\\\\text C$.\\n\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.95\\\\;\\\\mathrm{J/g\\\\cdot °C})(28.3\\\\;\\\\mathrm{ °C}-(-15.4)\\\\;\\\\mathrm{ °C})=860.6715\\\\;\\\\mathrm{J} \\\\]\\n\\nGG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GGGGGGGGGGGGGGGGGGGGG.\\n\\\\[q=nH_{fus}=(\\\\frac{10.1\\\\;\\\\mathrm{g}}{67.44\\\\;\\\\mathrm{g/mol}})(5720\\\\;\\\\mathrm{J})=856.6429\\\\;\\\\mathrm{J}\\\\]\\n\\nHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH $28.3^\\\\circ\\\\text C$ to $42.7^\\\\circ\\\\text C$.\\n\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.18\\\\;\\\\mathrm{J/g\\\\cdot °C})(42.7\\\\;\\\\mathrm{ °C}-28.3\\\\;\\\\mathrm{ °C})=171.6192\\\\;\\\\mathrm{J}\\\\]\\n\\nIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII.\\n\\\\[860.6715\\\\;\\\\mathrm{J}+856.6429\\\\;\\\\mathrm{J}+171.6192\\\\;\\\\mathrm{J}=1888.9336\\\\;\\\\mathrm{J}=1.89\\\\;\\\\mathrm{kJ}\\\\]\",\n"
          + "}";

  private static final String JSON2 =
      "{\n"
          + "  \"a\": \"AAAAA AAA AAA AAA AA AAA AA AAAAA AA AAAAA AAA AAAA AAAA AA AAAA AAAA AAAAA AAAAA AAAAA AAAAA AAAAAA AAAAA AAAAAA AAAAA AAA at $-15.4{^{\\\\,\\\\circ}\\\\text{C}}$ BBB BBBBB BB BBB $42.7{^{\\\\,\\\\circ}\\\\text{C}}$?\\n\\n(CC CC CCC CC CCCCC CCC CCC CCC CCC CCC CC = $1.95\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$; DDD DDD DDDD DDDD DDDDD DDDD DDD DD DDDD = $1.18\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$C; $\\\\Delta H_\\\\text{fus}$ = 5.72 kJ/mol; normal freezing point, $T_f$ = $28.3{^{\\\\,\\\\circ}\\\\text{C}}$)\",\n"
          + "  \"b\": \"*EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EEE.*\\n\\nFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F $-15.4^\\\\circ\\\\text C$ to $28.3^\\\\circ\\\\text C$.\\n\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.95\\\\;\\\\mathrm{J/g\\\\cdot °C})(28.3\\\\;\\\\mathrm{ °C}-(-15.4)\\\\;\\\\mathrm{ °C})=860.6715\\\\;\\\\mathrm{J} \\\\]\\n\\nGG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GGGGGGGGGGGGGGGGGGGGG.\\n\\\\[q=nH_{fus}=(\\\\frac{10.1\\\\;\\\\mathrm{g}}{67.44\\\\;\\\\mathrm{g/mol}})(5720\\\\;\\\\mathrm{J})=856.6429\\\\;\\\\mathrm{J}\\\\]\\n\\nHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH $28.3^\\\\circ\\\\text C$ to $42.7^\\\\circ\\\\text C$.\\n\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.18\\\\;\\\\mathrm{J/g\\\\cdot °C})(42.7\\\\;\\\\mathrm{ °C}-28.3\\\\;\\\\mathrm{ °C})=171.6192\\\\;\\\\mathrm{J}\\\\]\\n\\nIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII.\\n\\\\[860.6715\\\\;\\\\mathrm{J}+856.6429\\\\;\\\\mathrm{J}+171.6192\\\\;\\\\mathrm{J}=1888.9336\\\\;\\\\mathrm{J}=1.89\\\\;\\\\mathrm{kJ}\\\\]\",\n"
          + "}";

  public static void main(String[] args) {
    System.out.println(JSON);
  }

}

I ran the main method to ensure it is valid java source code

But when trying to format it using GJF, I got

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 42 out of bounds for length 22
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
	at java.base/java.util.Objects.checkIndex(Objects.java:385)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at java.base/java.util.Collections$UnmodifiableList.get(Collections.java:1502)
	at com.google.googlejavaformat.java.FormatterException.formatDiagnostics(FormatterException.java:70)
	at com.google.googlejavaformat.java.Main.formatFiles(Main.java:177)
	at com.google.googlejavaformat.java.Main.format(Main.java:128)
	at com.google.googlejavaformat.java.Main.main(Main.java:91)
	at com.google.googlejavaformat.java.Main.main(Main.java:81)
	at com.google.googlejavaformat.java.Main.main(Main.java:70)

Digging into the GJF, I found 2 issues:

The com.google.googlejavaformat.java.StringWrapper#applyReplacements give wrong result:

package question;

class T {

  private static final String JSON =
      "{\n"
          + "  \"a\": \"AAAAA AAA AAA AAA AA AAA AA AAAAA AA AAAAA AAA AAAA AAAA AA AAAA AAAA AAAAA"
          + " AAAAA AAAAA AAAAA AAAAAA AAAAA AAAAAA AAAAA AAA at $-15.4{^{\\\\,\\\\circ}\\\"
          + "\text{C}}$ BBB BBBBB BB BBB $42.7{^{\\\\,\\\\circ}\\\\text{C}}$?\\n"
          + "\\n"
          + "(CC CC CCC CC CCCCC CCC CCC CCC CCC CCC CC = $1.95\\\\;{\\\\text{J}/\\\"
          + "\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$; DDD DDD DDDD DDDD DDDDD DDDD DDD DD DDDD ="
          + " $1.18\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$C; $\\\\Delta"
          + " H_\\\\text{fus}$ = 5.72 kJ/mol; normal freezing point, $T_f$ ="
          + " $28.3{^{\\\\,\\\\circ}\\\\text{C}}$)\",\n"
          + "  \"b\": \"*EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE"
          + " EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE"
          + " EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EEE.*\\n"
          + "\\n"
          + "FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F"
          + " $-15.4^\\\\circ\\\\text C$ to $28.3^\\\\circ\\\\text C$.\\n"
          + "\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.95\\\\;\\\\mathrm{J/g\\\\cdot"
          + " °C})(28.3\\\\;\\\\mathrm{ °C}-(-15.4)\\\\;\\\\mathrm{ °C})=860.6715\\\\;\\\\mathrm{J}"
          + " \\\\]\\n"
          + "\\n"
          + "GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG"
          + " GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GGGGGGGGGGGGGGGGGGGGG.\\n"
          + "\\\\[q=nH_{fus}=(\\\\frac{10.1\\\\;\\\\mathrm{g}}{67.44\\\\;\\\\mathrm{g/mol}})(5720\\\\;\\\\mathrm{J})=856.6429\\\\;\\\\mathrm{J}\\\\]\\n"
          + "\\n"
          + "HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH $28.3^\\\\circ\\\\text C$ to"
          + " $42.7^\\\\circ\\\\text C$.\\n"
          + "\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.18\\\\;\\\\mathrm{J/g\\\\cdot"
          + " °C})(42.7\\\\;\\\\mathrm{ °C}-28.3\\\\;\\\\mathrm{"
          + " °C})=171.6192\\\\;\\\\mathrm{J}\\\\]\\n"
          + "\\n"
          + "IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII.\\n"
          + "\\\\[860.6715\\\\;\\\\mathrm{J}+856.6429\\\\;\\\\mathrm{J}+171.6192\\\\;\\\\mathrm{J}=1888.9336\\\\;\\\\mathrm{J}=1.89\\\\;\\\\mathrm{kJ}\\\\]\",\n"
          + "}";

  private static final String JSON2 =
      "{\n"
          + "  \"a\": \"AAAAA AAA AAA AAA AA AAA AA AAAAA AA AAAAA AAA AAAA AAAA AA AAAA AAAA AAAAA"
          + " AAAAA AAAAA AAAAA AAAAAA AAAAA AAAAAA AAAAA AAA at $-15.4{^{\\\\,\\\\circ}\\\"
          + "\text{C}}$ BBB BBBBB BB BBB $42.7{^{\\\\,\\\\circ}\\\\text{C}}$?\\n"
          + "\\n"
          + "(CC CC CCC CC CCCCC CCC CCC CCC CCC CCC CC = $1.95\\\\;{\\\\text{J}/\\\"
          + "\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$; DDD DDD DDDD DDDD DDDDD DDDD DDD DD DDDD ="
          + " $1.18\\\\;{\\\\text{J}/\\\\text{g}\\\\cdot{^{\\\\circ}\\\\text{C}}}$C; $\\\\Delta"
          + " H_\\\\text{fus}$ = 5.72 kJ/mol; normal freezing point, $T_f$ ="
          + " $28.3{^{\\\\,\\\\circ}\\\\text{C}}$)\",\n"
          + "  \"b\": \"*EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE"
          + " EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE"
          + " EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EE EEE.*\\n"
          + "\\n"
          + "FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F"
          + " $-15.4^\\\\circ\\\\text C$ to $28.3^\\\\circ\\\\text C$.\\n"
          + "\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.95\\\\;\\\\mathrm{J/g\\\\cdot"
          + " °C})(28.3\\\\;\\\\mathrm{ °C}-(-15.4)\\\\;\\\\mathrm{ °C})=860.6715\\\\;\\\\mathrm{J}"
          + " \\\\]\\n"
          + "\\n"
          + "GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG"
          + " GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GG GGGGGGGGGGGGGGGGGGGGG.\\n"
          + "\\\\[q=nH_{fus}=(\\\\frac{10.1\\\\;\\\\mathrm{g}}{67.44\\\\;\\\\mathrm{g/mol}})(5720\\\\;\\\\mathrm{J})=856.6429\\\\;\\\\mathrm{J}\\\\]\\n"
          + "\\n"
          + "HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH $28.3^\\\\circ\\\\text C$ to"
          + " $42.7^\\\\circ\\\\text C$.\\n"
          + "\\\\[q=mc\\\\Delta T=(10.1\\\\;\\\\mathrm{g})(1.18\\\\;\\\\mathrm{J/g\\\\cdot"
          + " °C})(42.7\\\\;\\\\mathrm{ °C}-28.3\\\\;\\\\mathrm{"
          + " °C})=171.6192\\\\;\\\\mathrm{J}\\\\]\\n"
          + "\\n"
          + "IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII.\\n"
          + "\\\\[860.6715\\\\;\\\\mathrm{J}+856.6429\\\\;\\\\mathrm{J}+171.6192\\\\;\\\\mathrm{J}=1888.9336\\\\;\\\\mathrm{J}=1.89\\\\;\\\\mathrm{kJ}\\\\]\",\n"
          + "}";

  public static void main(String[] args) {
    System.out.println(JSON);
  }
}

This result is completely not compilable

com.google.googlejavaformat.java.FormatterException#formatDiagnostics using wrong param to format the diagnostics: It uses the original java content (22 lines intotal) instead of formatted java content (79 lines in total). That is why we getting IndexOutOfBoundsException

Dominant language: Java
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Merged PRs (30d): 3

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